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Quantum mechanical operator related to rotational symmetry
mechanics, the angular momentum operator is one of several related operators analogous to classical angular momentum. The angular momentum operator plays a central
Angular_momentum_operator
Conserved physical quantity; rotational analogue of linear momentum
Angular momentum (sometimes called moment of momentum or rotational momentum) is the rotational analog of linear momentum. It is an important physical
Angular_momentum
Coupling in quantum physics
mechanics, angular momentum coupling is the procedure of constructing eigenstates of total angular momentum out of eigenstates of separate angular momenta
Angular_momentum_coupling
Intrinsic quantum property of particles
Spin is an intrinsic form of angular momentum carried by elementary particles, and thus by composite particles such as hadrons, atomic nuclei, and atoms
Spin_(physics)
Physical quantity carried in photons
The angular momentum of light is a vector quantity that expresses the amount of dynamical rotation present in the electromagnetic field of the light. While
Angular_momentum_of_light
Quantum number denoting orbital angular momentum
for an atomic orbital that determines its orbital angular momentum and describes aspects of the angular shape of the orbital. The azimuthal quantum number
Azimuthal_quantum_number
Quantum number related to rotational symmetry
angular momentum (i.e., its spin). If s is the particle's spin angular momentum and ℓ its orbital angular momentum vector, the total angular momentum
Total angular momentum quantum number
Total_angular_momentum_quantum_number
Coefficients in angular momentum eigenstates of quantum systems
numbers that arise in angular momentum coupling in quantum mechanics. They appear as the expansion coefficients of total angular momentum eigenstates in an
Clebsch–Gordan_coefficients
Tensor operator generalizes the notion of operators which are scalars and vectors
description of angular momentum in quantum mechanics and spherical harmonic functions. The coordinate-free generalization of a tensor operator is known as
Tensor_operator
Raising and lowering operators in quantum mechanics
oscillator and angular momentum. There is a relationship between the raising and lowering ladder operators and the creation and annihilation operators commonly
Ladder_operator
Topics referred to by the same term
quantum-mechanical angular momentum operator This disambiguation page lists articles associated with the title Spin angular momentum. If an internal link
Spin angular momentum (disambiguation)
Spin_angular_momentum_(disambiguation)
Angular momentum in special and general relativity
physics, relativistic angular momentum encompasses to the mathematical formalisms and physical concepts that define angular momentum in special relativity
Relativistic_angular_momentum
Quantum operator
{\mathbf {J} }}} is angular momentum operator, and ℏ {\displaystyle \hbar } is the reduced Planck constant. The rotation operator R ( z , θ ) {\displaystyle
Rotation operator (quantum mechanics)
Rotation_operator_(quantum_mechanics)
Pictorial computational technique in quantum chemistry
notably quantum chemistry, angular momentum diagrams, or more accurately from a mathematical viewpoint angular momentum graphs, are a diagrammatic method
Angular momentum diagrams (quantum mechanics)
Angular_momentum_diagrams_(quantum_mechanics)
Theorem used in quantum mechanics for angular momentum calculations
tensor operators in the basis of angular momentum eigenstates can be expressed as the product of two factors, one of which is independent of angular momentum
Wigner–Eckart_theorem
Relation satisfied by conjugate variables in quantum mechanics
}{\hbar c}}\right)} and Λ = Λ(x,t) is the gauge function. The angular momentum operator is L = r × p {\displaystyle L=r\times p\,\!} and obeys the canonical
Canonical commutation relation
Canonical_commutation_relation
Quantum explanation of electromagnetic polarization
{L}}\vert ^{2}.} An operator S has been associated with an observable quantity, the spin angular momentum. The eigenvalues of the operator are the allowed
Photon_polarization
Coordinates comprising a distance and two angles
reduces to vector calculus in polar coordinates. The corresponding angular momentum operator then follows from the phase-space reformulation of the above,
Spherical_coordinate_system
Topics referred to by the same term
Orbital angular momentum is a concept in classical mechanics. It may also refer to: One of three main quantum angular momentum operators Orbital angular momentum
Orbital angular momentum (disambiguation)
Orbital_angular_momentum_(disambiguation)
of quantum angular momentum, predicated on the action of these operators on Fock states built of arbitrary higher powers of such operators. For instance
Jordan_map
Type of angular momentum in light
The orbital angular momentum of light (OAM) is the component of angular momentum of a light beam that is dependent on the field spatial distribution, and
Orbital angular momentum of light
Orbital_angular_momentum_of_light
Two systems are coupled if they are interacting with each other
coupled angular momenta. Due to the conservation of angular momentum and the nature of the angular momentum operator, the total angular momentum is always
Coupling_(physics)
Quantised attribute of electrons in free space
can carry quantized orbital angular momentum (OAM) projected along the direction of propagation. This orbital angular momentum corresponds to helical wavefronts
Orbital angular momentum of free electrons
Orbital_angular_momentum_of_free_electrons
Special functions on a sphere
basis for the angular momentum operator, the spinor spherical harmonics are a basis for the total angular momentum operator (angular momentum plus spin)
Spinor_spherical_harmonics
Model of rotating physical systems
rotor angular momentum operators is given here (but beware, they must be multiplied with ℏ {\displaystyle \hbar } ). The body-fixed angular momentum operators
Rigid_rotor
Scalar measure of the rotational inertia with respect to a fixed axis of rotation
object. Alternatively it can also be written in terms of the angular momentum operator [ r ] x = r × x {\displaystyle [\mathbf {r} ]\mathbf {x} =\mathbf
Moment_of_inertia
Specific quantum state of a quantum harmonic oscillator
quantum system with angular momentum operator J = ( J x , J y , J z ) {\displaystyle \mathbf {J} =(J_{x},J_{y},J_{z})} and angular momentum quantum number
Coherent_state
Concept in quantum mechanics
commuting operators, we can find a unitary transformation which will simultaneously diagonalize all of them. Two components of the angular momentum operator L
Complete set of commuting observables
Complete_set_of_commuting_observables
Distinguished element of a Lie algebra's center
algebra of a Lie algebra. A prototypical example is the squared angular momentum operator, which is a Casimir element of the three-dimensional rotation
Casimir_element
Theory of NMR spectroscopy based on Quantum mechanics
spectroscopy uses the intrinsic magnetic moment that arises from the spin angular momentum of a spin-active nucleus. If the element of interest has a nuclear
Quantum mechanics of nuclear magnetic resonance spectroscopy
Quantum_mechanics_of_nuclear_magnetic_resonance_spectroscopy
Quantum operator for the sum of energies of a system
{J}}_{y}} , and J ^ z {\displaystyle {\hat {J}}_{z}} are the total angular momentum operators (components), about the x {\displaystyle x} , y {\displaystyle
Hamiltonian (quantum mechanics)
Hamiltonian_(quantum_mechanics)
Angular momentum deriving from photon spin
The spin angular momentum of light (SAM) is the component of angular momentum of light that is associated with the quantum spin and the rotation between
Spin angular momentum of light
Spin_angular_momentum_of_light
Function acting on the space of physical states in physics
any linear operator for some observable A (such as position, momentum, energy, angular momentum etc.). If ψ is an eigenfunction of the operator A ^ {\displaystyle
Operator_(physics)
Quantum state
two-state atoms. A Dicke state is the simultaneous eigenstate of the angular momentum operators J → 2 {\displaystyle {\vec {J}}^{2}} and J z . {\displaystyle
Dicke_state
Vector used in astronomy
operator, and I is the identity operator. Applying these ladder operators to the eigenstates |ℓmn〉 of the total angular momentum, azimuthal angular momentum
Laplace–Runge–Lenz_vector
Quantum mechanical property
orbital angular momentum (the angular momentum about the axis of rotation) and spin angular momentum, which is the object's angular momentum about its
Orbital_motion_(quantum)
Algebraic object with geometric applications
tensor), used to represent momentum fluxes Spherical tensor operators are the eigenfunctions of the quantum angular momentum operator in spherical coordinates
Tensor
Matrices important in quantum mechanics and the study of spin
above. In quantum mechanics, each Pauli matrix is related to an angular momentum operator that corresponds to an observable describing the spin of a spin
Pauli_matrices
Physical quantity of interest in chemistry and electrodynamics
the total angular momentum operator J, with J = L + S {\displaystyle \mathbf {J} =\mathbf {L} +\mathbf {S} } where S is the spin operator with eigenvalue
Mass-to-charge_ratio
Magnetic property
orbital angular momentum operator, S {\displaystyle \mathbf {S} } the spin and r ⊥ {\displaystyle r_{\perp }} is the component of the position operator orthogonal
Van_Vleck_paramagnetism
Atoms with a single valence electron, so they behave like hydrogen
hydrogen-like atomic orbitals are eigenfunctions of the one-electron angular momentum operator L (more precisely, its square, L2) and its z-component Lz. A hydrogen-like
Hydrogen-like_atom
Special mathematical functions defined on the surface of a sphere
\mathbb {C} } are eigenfunctions of the square of the orbital angular momentum operator − i ℏ r × ∇ , {\displaystyle -i\hbar \mathbf {r} \times \nabla
Spherical_harmonics
Foundational principle in quantum physics
{\frac {\hbar }{2}}.} Angular momentum uncertainty relation: For two orthogonal components of the total angular momentum operator of an object: σ J i σ
Uncertainty_principle
Concepts from linear algebra
kx=\omega ^{2}mx} where ω2 is the eigenvalue and ω is the (imaginary) angular frequency. The principal vibration modes are different from the principal
Eigenvalues_and_eigenvectors
Properties underlying modern physics
and spin angular momentum operators satisfy. Therefore, A and B form operator algebras analogous to angular momentum; same ladder operators, z-projections
Symmetry_in_quantum_mechanics
Spectral line splitting in magnetic field
electronic angular momentum, and g {\displaystyle g} is the Landé g-factor. A more accurate approach is to take into account that the operator of the magnetic
Zeeman_effect
Elementary particles with a spin of 1/2
relations as other angular momentum operators. One consequence of the generalized uncertainty principle is that the spin projection operators (which measure
Spin_1/2
Atom of the element hydrogen
as simultaneous eigenstates of the angular momentum operator. This corresponds to the fact that angular momentum is conserved in the orbital motion of
Hydrogen_atom
Concept in mathematics
^{ij}=\delta ^{ij}} , and so the squared angular momentum operator for the rotation group is that Casimir operator. That is, C ( 2 ) = L 2 = e 1 ⊗ e 1 +
Universal_enveloping_algebra
Operator in quantum field theory
pseudovector is an operator defined from the momentum and angular momentum, used in the quantum-relativistic description of angular momentum. It is named after
Pauli–Lubanski_pseudovector
Function describing an electron in an atom
respectively correspond to an electron's energy, its orbital angular momentum, and its orbital angular momentum projected along a chosen axis (magnetic quantum number)
Atomic_orbital
Transformation in quantum mechanics
are the three components of the angular momentum operators, which are crucial in many quantum systems. These operators are complicated, and one would like
Holstein–Primakoff transformation
Holstein–Primakoff_transformation
Writing Lie algebra sets as matrices
collection of operators on V {\displaystyle V} satisfying some fixed set of commutation relations, such as the relations satisfied by the angular momentum operators
Lie_algebra_representation
Property of a mass in motion
In Newtonian mechanics, momentum (pl.: momenta or momentums; more specifically linear momentum or translational momentum) is the product of the mass and
Momentum
Time reversal symmetry in physics
J_{y}}K} where J y {\displaystyle J_{y}} is the y-component of the angular momentum operator and K {\displaystyle K} is complex conjugation, as before. This
T-symmetry
Converting classical mechanics to quantum mechanics
being rather close to the correct expression for the orbital angular momentum operator's (eigenvalue) quantum number for large values of the quantum number
First_quantization
Linear operator equal to its own adjoint
physical observables such as position, momentum, angular momentum and spin are represented by self-adjoint operators on a Hilbert space. Of particular significance
Self-adjoint_operator
but differ in electric charges. Isospin formally behaves as an angular momentum operator and thus satisfies the appropriate canonical commutation relations
Isospin_multiplet
Physical constant in quantum mechanics
relates the energy of a photon to its angular frequency, and the linear momentum of a particle to the angular wavenumber of its associated matter wave
Planck_constant
Raising and lowering operators
oscillator and angular momentum. Another type of operator in quantum field theory, discovered in the early 1970s, is known as the anti-symmetric operator. This
Anti-symmetric_operator
1922 physical experiment demonstrating that atomic spin is quantized
Stern–Gerlach experiment demonstrated that the spatial orientation of angular momentum is quantized. Thus an atomic-scale system was shown to have intrinsically
Stern–Gerlach_experiment
Relativistic interaction in quantum physics
ΔH. To find out what basis this is, we first define the total angular momentum operator J = L + S . {\displaystyle \mathbf {J} =\mathbf {L} +\mathbf {S}
Spin–orbit_interaction
Linear combination of Slater determinants
eigenstate of the square of the angular momentum operator, L ^ 2 {\displaystyle {\hat {L}}^{2}} the z-projection of angular momentum L ^ z {\displaystyle {\hat
Configuration_state_function
Spin representations of the SO(3) group
total angular momentum operator, J → {\displaystyle {\vec {\mathbb {J} }}} , of a particle corresponds to the sum of the orbital angular momentum (i.e
Spinors_in_three_dimensions
Formal constraint in quantum mechanics
the total angular momentum of the atom is F = I + J , {\displaystyle F=I+J,} where I {\displaystyle I} is the nuclear spin angular momentum and J {\displaystyle
Selection_rule
Classic entropy of a quantum-mechanical density matrix
angular momentum J, and shall denote by S = ( S x , S y , S z ) {\displaystyle \mathbf {S} =(S_{x},S_{y},S_{z})} the usual angular momentum operators
Wehrl_entropy
Technique in computational quantum field theory
the modulus k = | k → | {\displaystyle k=|{\vec {k}}|} . The angular momentum operator reads: J → = − i [ k → × ∂ k → ] {\displaystyle {\vec {J}}=-i[{\vec
Light_front_quantization
Tensor formulation of non-relativistic physics
i {\displaystyle J_{i}} stands for a generator of rotations (angular momentum operator). The generator P 5 {\displaystyle P_{5}} is a Casimir invariant
Galilei-covariant tensor formulation
Galilei-covariant_tensor_formulation
Physical spaces representing position and momentum, Fourier-transform duals
the dynamics of the system. This form may be more useful when momentum or angular momentum enters the Lagrangian. In Hamiltonian mechanics, unlike Lagrangian
Position_and_momentum_spaces
Type of complex number
quantum state functions. For example, the eigenfunctions of the angular momentum operator are uniquely defined "except for a phase factor". In defining
Phase_factor
Independent parameter describing the state of a physical system
function, and operators which correspond to other degrees of freedom have discrete spectra. For example, intrinsic angular momentum operator (which corresponds
Degrees of freedom (physics and chemistry)
Degrees_of_freedom_(physics_and_chemistry)
Quantum mechanics taking into account particles near or at the speed of light
Hamiltonian operators, since the latter can become extremely complicated, see (for example) Weinberg (1995). In non-relativistic QM, the angular momentum operator
Relativistic quantum mechanics
Relativistic_quantum_mechanics
Special low-energy state in quantum mechanics
term "singlet" originally meant a linked set of particles whose net angular momentum is zero, that is, whose overall spin quantum number s = 0 {\displaystyle
Singlet_state
relativity, used to represent momentum fluxes Spherical tensor operators are the eigenfunctions of the quantum angular momentum operator in spherical coordinates
Introduction to the mathematics of general relativity
Introduction_to_the_mathematics_of_general_relativity
Quantum mechanics concept for systems with central potentials, such as atoms
{L}}^{2}\right].} where L ^ 2 {\displaystyle {\hat {L}}^{2}} is the angular momentum operator (specifically, its magnitude squared). It's defined (non-dimensionally)
Particle in a spherically symmetric potential
Particle_in_a_spherically_symmetric_potential
Type of quantum state
to consider the atoms as spin-1/2 particles with corresponding angular momentum operators defined as J v = ∑ i = 1 N j v ( i ) {\displaystyle J_{v}=\sum
Squeezed_coherent_state
Relativistic wave equation describing massless fermions
the particles, the projection of angular momentum operator J {\displaystyle \mathbf {J} } onto the linear momentum p {\displaystyle \mathbf {p} } : p
Weyl_equation
Concept in physics and mathematics
(Galileian boosts), and Lij stands for a generator of rotations (angular momentum operator). This Lie Algebra is seen to be a special classical limit of
Galilean_transformation
Symmetry group
P_{a},K_{a},H} are generators of rotations (angular momentum operator), spatial translations (momentum operator), Galilean boosts and time translation (Hamiltonian)
Schrödinger_group
Quantum mechanical equation of motion of charged particles in magnetic field
} where L ^ {\textstyle \mathbf {\hat {L}} } is the particle angular momentum operator and we neglected terms in the magnetic field squared B 2 {\textstyle
Pauli_equation
Atom of helium
commutes with all spin operators. Since it is also rotationally invariant, the total x, y or z component of angular momentum operator also commutes with the
Helium_atom
{J}}={\boldsymbol {L}}+{\boldsymbol {S}}} , which is the total angular momentum operator. In other words, m l , m s {\displaystyle m_{\text{l}},m_{s}}
Good_quantum_number
Rules in computational chemistry
Examples are the kinetic energy, dipole moment, and total angular momentum operators. A one-body operator in an N-particle system is decomposed as G ^ 1 = ∑
Slater–Condon_rules
Representation theory of the symmetries of non-relativistic quantum space
translations (momentum operator), Ci is the generator of Galilean boosts, and Lij stands for a generator of rotations (angular momentum operator). The central
Representation theory of the Galilean group
Representation_theory_of_the_Galilean_group
Quantized magnetization of charged particles
the electron, Ψ is the ground-state wave function, and L is the angular momentum operator. The total magnetic moment is m = m o r b + m s p i n {\displaystyle
Orbital_magnetization
hydrogen identical particles angular momentum angular momentum operator rotational invariance rotational symmetry rotation operator translational symmetry Lorentz
List of mathematical topics in quantum theory
List_of_mathematical_topics_in_quantum_theory
Mathematical function with multiple real-number arguments
Laplace's equation, as well as the eigenfunctions of the z-component angular momentum operator, which are complex-valued functions of real-valued spherical polar
Function of several real variables
Function_of_several_real_variables
Nuclear shell model
in the spherical basis, ℓ {\displaystyle \ell } is the orbital angular momentum operator, ℓ 2 {\displaystyle \ell ^{2}} is its square (with eigenvalues
Nilsson_model
Simple quantum mechanical system
equation can be derived by considering the time evolution of the angular momentum operator in the Heisenberg picture. i ℏ d σ j d t = [ σ j , H ] = [ σ j
Two-state_quantum_system
Conservation law
becomes the Hamiltonian operator, angular momentum the angular momentum operator, and the Fradkin tensor the Fradkin operator. All of the above properties
Fradkin_tensor
Mathematical objects more general than vectors
{D}}}=2({\hat {n}}+2)^{2}} . The ladder operator is now associated with the angular momentum operator and additional operator of rotations in 4D space A ^ {\displaystyle
Harmonic_tensors
Structure dual to a unital associative algebra
|A\rangle \otimes |B\rangle } . This is provided by the total angular momentum operator, which extracts the needed quantity from each side of the tensor
Coalgebra
Description of the ground state of a quantum system
{\hat {L}}=-i\hbar {\frac {\partial }{\partial \theta }}} is the angular-momentum operator. The solution for condensate wavefunction Ψ ( r , t ) {\displaystyle
Gross–Pitaevskii_equation
Projection of spin along the direction of momentum
momentum operator and Σ ^ {\displaystyle {\hat {\mathbf {\Sigma } }}} is the spin operator. The angular momentum J is the sum of an orbital angular momentum
Helicity_(particle_physics)
Tensor describing energy momentum density in spacetime
this with the symmetry of the stress–energy tensor, one can show that angular momentum is also conserved: 0 = ( x α T μ ν − x μ T α ν ) , ν . {\displaystyle
Stress–energy_tensor
Particle effect
{\textstyle c} is the speed of light, p j {\textstyle p_{j}} is the momentum operator, and β {\displaystyle \beta } and α j {\displaystyle \alpha _{j}}
Zitterbewegung
Symmetry of physical laws under a charge-conjugation transformation
^{\mu \nu }=i\left[\gamma ^{\mu },\gamma ^{\nu }\right]/2} is the angular momentum operator and ϵ i j k {\displaystyle \epsilon _{ijk}} is the totally antisymmetric
C-symmetry
Quasilinear first-order ordinary differential equation
the angular velocity. In an inertial frame of reference (subscripted "in"), Euler's second law states that the time derivative of the angular momentum L
Euler's equations (rigid body dynamics)
Euler's_equations_(rigid_body_dynamics)
Physical object which does not deform when forces or moments are exerted on it
describing the motion of a rigid body, such as linear and angular velocity, acceleration, momentum, impulse, and kinetic energy. The linear position can be
Rigid_body
Hamiltonian operator for molecules
is a component of an operator known as the vibrational angular momentum operator (although it does not satisfy angular momentum commutation relations)
Molecular_Hamiltonian
ANGULAR MOMENTUM-OPERATOR
ANGULAR MOMENTUM-OPERATOR
Boy/Male
Arabic, Muslim, Parsi, Pashtun
Embers
Girl/Female
Tamil
Moment
Boy/Male
Hindu, Indian, Kannada, Tamil
Witty; Super
Girl/Female
Tamil
Moment
Girl/Female
Hindu
Moment
Surname or Lastname
English (Lincolnshire and Yorkshire)
English (Lincolnshire and Yorkshire) : unexplained.
Girl/Female
Indian, Tamil
Lovely; Kind-hearted
Girl/Female
Assamese, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Sanskrit, Sindhi, Tamil, Telugu
Not Wild; Gentle
Girl/Female
French Spanish American Italian Latin Greek
Angel.
Girl/Female
Afghan, American, British, Christian, English, Finnish, French, Greek, Indian, Irish, Lebanese, Polish, Portuguese, Romanian, Spanish, Swedish, Tamil
Heavenly Messenger; Angel; Messenger from God
Boy/Male
Gujarati, Hindu, Indian, Kannada
Spark of Fire
Girl/Female
Muslim
Moment
Boy/Male
Indian, Sanskrit
Radiant; Bright; Enlightening
Girl/Female
Hindu
Moment
Boy/Male
Indian, Sanskrit
Praising; A Hymn
Girl/Female
Christian & English(British/American/Australian)
Angelic
Female
English
Feminine form of Latin Angelus, ANGELA means "angel, messenger."
Boy/Male
Hindu, Indian, Sanskrit
Moment
Girl/Female
American, Australian, British, English
Beautiful Goddess
Boy/Male
Arabic, Hindu, Indian, Muslim
Shining
ANGULAR MOMENTUM-OPERATOR
ANGULAR MOMENTUM-OPERATOR
Biblical
divining
Girl/Female
Muslim
Petals of flowers
Girl/Female
Hindu, Indian
Sunshine; Held in the Lap of the Sun God
Boy/Male
Muslim
Sword
Girl/Female
Indian
Rising star
Male
English
Variant spelling of English Kendrick, KENRICK means "keen power."
Female
English
Probably a variant spelling of English Kayla, KEILA means "slender."
Boy/Male
Hindu, Indian, Traditional
Lord Rama
Boy/Male
Arabic, Indian, Kashmiri, Muslim
The Chosen One
Boy/Male
American, Anglo, Australian, British, Chinese, English, German, Teutonic, Welsh
Lover of the Sea; Sea Lover; Mariner; Sea Hill
ANGULAR MOMENTUM-OPERATOR
ANGULAR MOMENTUM-OPERATOR
ANGULAR MOMENTUM-OPERATOR
ANGULAR MOMENTUM-OPERATOR
ANGULAR MOMENTUM-OPERATOR
n.
Impulsive power; force; momentum.
adv.
In a moment; every moment; momentarily.
a.
Measured by an angle; as, angular distance.
a.
Relating to an angle or to angles; having an angle or angles; forming an angle or corner; sharp-cornered; pointed; as, an angular figure.
a.
Important; momentous.
pl.
of Ungula
v. t.
To make angular.
adv.
In an angular manner; with of at angles or corners.
a.
Constituted, selected, or conducted in conformity with established usages, rules, or discipline; duly authorized; permanently organized; as, a regular meeting; a regular physican; a regular nomination; regular troops.
a.
Lasting but a moment; brief.
adv.
For a moment.
a.
Having the form of a ring; annular.
pl.
of Momentum
pl.
of Momentum
a.
Of or pertaining to the jugular vein; as, the jugular foramen.
a.
Fig.: Lean; lank; raw-boned; ungraceful; sharp and stiff in character; as, remarkably angular in his habits and appearance; an angular female.
adv.
In an angular manner; angularly.
a.
Of or pertaining to moment or momentum.
a.
Of moment or consequence; very important; weighty; as, a momentous decision; momentous affairs.
a.
Not angular.