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Topics referred to by the same term
Look up undefined in Wiktionary, the free dictionary. Undefined may refer to: Undefined (mathematics), with several related meanings Indeterminate form
Undefined
Expression which is not assigned an interpretation
In mathematics, the term undefined refers to a value, function, or other expression that cannot be assigned a meaning within a specific formal system
Undefined_(mathematics)
An undefined variable in the source code of a computer program is a variable that is accessed in the code but has not been declared by that code. In some
Undefined_variable
Unpredictable result when running a program
A computer program exhibits undefined behavior (UB) when it contains, or is executing code for which its programming language specification does not mandate
Undefined_behavior
In computing, a condition where an expression does not have a correct value
In computing (particularly, in programming), undefined value is a condition where an expression in a programming language does not have a semantically
Undefined_value
2009 bullet hell video game
Touhou Seirensen ~ Undefined Fantastic Object. (Japanese: 東方星蓮船 ～ Undefined Fantastic Object.; lit. "Star-Lotus Ship of the East") is the twelfth main
Undefined_Fantastic_Object
Concept that is not defined in terms of previously defined concepts
understandable; the expressions in this group we call PRIMITIVE TERMS or UNDEFINED TERMS, and we employ them without explaining their meanings. At the same
Primitive_notion
Probability distribution
"pathological" distribution since both its expected value and its variance are undefined (but see § Moments below). The Cauchy distribution does not have finite
Cauchy_distribution
cryptocurrencies varies substantially from one jurisdiction to another, and is still undefined or changing in many of them. While in the majority of countries the usage
Legality of cryptocurrency by country or territory
Legality_of_cryptocurrency_by_country_or_territory
File format standard for electronic business cards
biker CLASS Undefined Optional Undefined Describes the sensitivity of the information in the vCard. CLASS:public CLIENTPIDMAP Undefined Undefined Optional
VCard
Set of rules defining correctly structured programs
the undefined value is considered a false value. Note: undefined is considered a genuine primitive type. Unless explicitly converted, the undefined value
JavaScript_syntax
Defunct American truck manufacturer
Notes Marmon CHDT Undefined-1997 Conventional Heavy Duty Tractor Marmon 54-F Undefined-1997 Conventional Fleet 54" cab Marmon 54-P Undefined-1997 Conventional
Marmon_Motor_Company
Slavery as a means to repay debt
the undefined or excessive debt repayment. The services required to repay the debt may be undefined, and the services' duration may be undefined, thus
Debt_bondage
Class of mathematical expression
more general numerical structures called fields leaves division by zero undefined, and situations where division by zero might occur must be treated with
Division_by_zero
citizen. Male Estonian citizens are required to take up national service. 'Undefined citizenship' (Estonian: kodakondsuseta isik, Russian: негражданин) is
Estonian_nationality_law
Standard for financial instrument codes
attributes, that varies between groups. The letter X always means Not Appl./Undefined. Central Index Key – Identifier issued by the US SEC CUSIP – Code identifying
ISO_10962
Key on computer keyboards
Ctrl+Insert Copy undefined or rarely used Copy Ctrl+PgDn Next tab undefined or rarely used Scroll window to the right Ctrl+PgUp Previous tab undefined or rarely
Control_key
Undocumented CPU instruction that has an effect
In computer science, an illegal opcode, also called an unimplemented operation, unintended opcode or undocumented instruction, is an instruction to a CPU
Illegal_opcode
Vassal state of the Crusader Kingdom of Jerusalem (1118–87)
lordships of the Kingdom of Jerusalem. It encompassed an extensive and partly undefined region to the east of the Jordan River, and was centered on the castles
Lordship_of_Transjordan
Area of geometry, about angles and lengths
undefined − 2 {\displaystyle -2} − 2 {\displaystyle -{\sqrt {2}}} − 2 3 / 3 {\displaystyle -2{\sqrt {3}}/3} − 1 {\displaystyle -1} cosecant undefined
Trigonometry
Mathematical expression with disputed status
and software. While many follow the convention 00 = 1, others leave it undefined or return errors, depending on the context. Many widely used formulas
Zero_to_the_power_of_zero
Minimum horizontal distance to a point of equal elevation
submarine summits. Mount Everest, the highest point on Earth, has an undefined isolation, since there is no higher point to reference. Because topographic
Topographic_isolation
Species of succulent
Gasteria carinata, commonly called Bredasdorp gasteria or keeled gasteria, is a small and variable succulent plant native to the Western Cape Province
Gasteria_carinata
Country in West Asia
the border between the two countries. Yemen's northern border had been undefined; the Arabian Desert prevented any human habitation there. The Saudi–Yemen
Yemen
Dose dependant harmfulness of substances
The table below shows the upper limits for each category. Note: The undefined values are expected to be roughly equivalent to the category 5 values
Toxicity
306 (0.08%) Romani - 157 (0.04%) others - 1,847 (0.47%) undeclared and undefined - 18,610 (4.73%) regional affiliation - 891 (0.23%) unknown - 2,218 (0
Demographics_of_Montenegro
Computer science topic
multiplication by four. Shifts can result in implementation-defined behavior or undefined behavior, so care must be taken when using them. The result of shifting
Bitwise_operation
Chinese-administered area of Kashmir
Karakoram and Kuen Lun mountains) as a part of Kashmir under the caption "Undefined Frontier area". In 1959, the Pakistani government became concerned over
Trans-Karakoram_Tract
superlatives. The variation is because the term production car is otherwise undefined. Because of the inconsistencies with the various definitions of production
List of production car speed records
List_of_production_car_speed_records
Number
results in 0, and consequently dividing by 0 is generally considered to be undefined in arithmetic. As a numerical digit, 0 plays a crucial role in decimal
0
A fanciful being whose undefined appearance and essence is left to imagination
The Whangdoodle is a fanciful or humorous being whose undefined appearance and essence is left to individual imagination. Other connotations may include
Whangdoodle
Programming language construct specifying an identifier's properties
In computer programming, a declaration in a syntactic language construct is the process of specifying identifier properties for its initialization: it
Declaration (computer programming)
Declaration_(computer_programming)
International border
Olivenza sector unmapped due to the unresolved sovereignty dispute (see The undefined sector). Convention of Limits (1926) - Demarcating the border from the
Portugal–Spain_border
Type of energy transfer
law. Just as temperature may be undefined for a sufficiently inhomogeneous system, so also may entropy be undefined for a system not in its own state
Heat
High-level programming language
manually set to `undefined` like so let x2 = undefined; // Declares a block-scoped variable named `y`, and implicitly sets it to // `undefined`. The `let`
JavaScript
Term to indicate an uncertain taxonomic position
used for a taxonomic group whose broader relationships are unknown or undefined. Alternatively, such groups are frequently referred to as "enigmatic taxa"
Incertae_sedis
(therefore ranging from 0 to 255, with the latter having the meaning of "undefined" or "not set"), allowing each file to have at most one genre out of a
List_of_ID3v1_genres
Distribution of variables which satisfies a stability property under linear combinations
\rightarrow 0} . The distributions have undefined variance for α < 2 {\displaystyle \alpha <2} , and undefined mean for α ≤ 1 {\displaystyle \alpha \leq
Stable_distribution
First Australian national population census
0 Protestant (undefined) 109,861 2.46 Roman Catholic 921,425 20.7 Greek Catholic 2,646 0.0 Catholic (undefined) 75,379 1.7 Others
1911_Australian_census
production model tests were conducted under a variety of unequal or undefined conditions, and tested by numerous different sources, mainly motorcycling
List of fastest production motorcycles
List_of_fastest_production_motorcycles
Period following the breakup of a relationship
A rebound is an undefined period following the breakup of a romantic and/or sexual relationship. The term's use dates back to at least the 1830s, when
Rebound_(dating)
Joke ransomware
to achieve a required number of points in the shoot 'em up video game Undefined Fantastic Object before any decryption can take place. The main window
Rensenware
Standardized digital audio interface
length) 4–7 Undefined 5–10 0-7 EAN-13 code (possibly in binary-coded decimal) 11 0-3 4–7 Undefined; padding on 13-digit EAN code 12–13 0-7 Undefined 14 0–3
S/PDIF
Revision of the C++ programming language released in 2026
Standard C++. The Standard C++ Foundation. Retrieved 6 September 2025. Undefined Behavior, cppreference.com cppreference.com. "C++ attribute: indeterminate
C++26
Standard for connecting GPUs to power supplies
12VHPWR (5.0) 12VHPWR (ECR) 12v-2x6 Open Open 225/450 100/150 0/0 Shorted Undefined, treated as Open/Open 100/150 Ground Open 375/600 150/300 150/300 Open
12VHPWR
2003 roleplaying game
to two entries that are not yet written. These are called "undefined" entries. Undefined entries must begin with a letter later in the alphabet. The
Lexicon_(role-playing_game)
Mathematical concept
(1+2x)=2+4x=2,} of degree 0. The degree of the zero polynomial is either left undefined, or is defined to be negative (usually −1 or − ∞ {\displaystyle -\infty
Degree_of_a_polynomial
International maritime border between Indonesia and Singapore
western part of the Straits of Singapore. The remaining portion of the undefined boundary is called the "eastern segment" as it lies to the east of the
Indonesia–Singapore_border
South Korean singer and dancer (born 2001)
chart positions, showing year released and album title Title Year Peak chart positions Album KOR DL "Mine" 2024 51 Born to Be "Undefined" 2026 66 Motto
Chaeryeong
Vowel sound represented by ⟨ɜ⟩ in IPA
explicitly denote the lack of rounding (the canonical value of IPA ⟨ə⟩ is undefined for rounding). Its vowel height is open-mid, also known as low-mid, which
Open-mid central unrounded vowel
Open-mid_central_unrounded_vowel
Medical condition
Paraumbilical Femoral Obturator Spigelian Lumbar Petit's Grynfeltt–Lesshaft Undefined location Incisional Internal hernia Richter's Peritoneal Peritonitis Spontaneous
Checkpoint inhibitor induced colitis
Checkpoint_inhibitor_induced_colitis
Topics referred to by the same term
operator which produces a result that is the negation of logical OR An undefined object, in mathematical well-definition A mathematical symbol for "approaching
↓
Chemical compound (Cr(OH)3)
inorganic compound with the chemical formula Cr(OH)3. It is a polymer with an undefined structure and low solubility. It is amphoteric, dissolving in both strong
Chromium(III)_hydroxide
Topics referred to by the same term
NULL, nil, or None), used in computer programming for an uninitialized, undefined, empty, or meaningless value Jednostka Wojskowa Nil or NIL, a Polish commando
Nil
Effect of alcohol consumption on the human body
Paraumbilical Femoral Obturator Spigelian Lumbar Petit's Grynfeltt–Lesshaft Undefined location Incisional Internal hernia Richter's Peritoneal Peritonitis Spontaneous
Alcohol_flush_reaction
Protrusion of tissue through a hole in the abdominal wall near the navel
Paraumbilical Femoral Obturator Spigelian Lumbar Petit's Grynfeltt–Lesshaft Undefined location Incisional Internal hernia Richter's Peritoneal Peritonitis Spontaneous
Paraumbilical_hernia
Works outside the scope of copyright law
public domain may also be interchangeably used with other imprecise or undefined terms such as the public sphere or commons, including concepts such as
Public_domain
Probability distribution with high skewness or kurtosis
exception of the normal distribution) have "undefined sigma" (more technically, the variance is undefined). As a consequence, when data arise from an
Fat-tailed_distribution
Ukrainian association football club
the 2014 pro-Russian unrest in Ukraine, the project was suspended for undefined period. In the summer of 2015 there was created a public organization
FC_Kryvbas_Kryvyi_Rih
Computer program variable of undefined value
< 10; i++) { k = k + 1; } printf("%d", k); } The final value of k is undefined. The answer that it must be 10 assumes that it started at zero, which
Uninitialized_variable
2026 video game
progression system additions are planned for the middle of 2026. Additional undefined updates are planned for late 2026/27. Reception Kiln was released on April
Kiln_(video_game)
Computational operation
§ In programming languages for details). Some systems leave a modulo 0 undefined, though others define it as a. Many implementations use truncated division
Modulo
Tool to detect memory-related bugs
code sanitizer is a programming tool that detects bugs in the form of undefined or suspicious behavior by a compiler inserting instrumentation code at
Code_sanitizer
Investigational substance-related disorder drugs
(non-selective monoamine receptor modulator) – bipolar disorders [1] ALM-008 – undefined mechanism of action (mood stabilizer) – bipolar disorders [2] Azetukalner
List of investigational bipolar disorder drugs
List_of_investigational_bipolar_disorder_drugs
Country in West Asia
Emirates and Oman are not precisely marked, the exact size of the country is undefined. The United Nations Statistics Division estimates 2149690 km2 (830000 sq mi)
Saudi_Arabia
Mathematical techniques for summing divergent infinite series
study of divergent infinite series, for which conventional summation is undefined. Since there are no properties of an entire sum, the Ramanujan summation
Ramanujan_summation
Award
(51%) of original episodes during the eligibility period. In cases of undefined billing in foreign productions where series regular, guest star, and co-star
Actor Award for Outstanding Performance by an Ensemble in a Comedy Series
Actor_Award_for_Outstanding_Performance_by_an_Ensemble_in_a_Comedy_Series
Pairs of molecules with same chemical formula showing different spatial orientations
Cis–trans isomerism, also known as geometric isomerism, describes certain arrangements of atoms within molecules. The prefixes "cis" and "trans" are from
Cis–trans_isomerism
Purposely unassigned Unicode code points
(U+F0000–U+FFFFD, U+100000–U+10FFFD), respectively. They are intentionally left undefined so that third parties may assign their own characters without conflicting
Private_Use_Areas
Solid, liquid or gel used to grow microorganisms or cells
distinction between growth media types is that of chemically defined versus undefined media. A defined medium will have known quantities of all ingredients
Growth_medium
Probability distribution
tail, the moments of the distribution, such as mean or variance, are undefined. The distribution is a particular case of stable distribution. The probability
Landau_distribution
Point where the derivative of a function is zero or undefined (in certain cases)
the argument of a function where the function derivative is zero (or undefined, as specified below). The value of the function at a critical point is
Critical_point_(mathematics)
Instruction for x86 processors
AND is discarded. The OF and CF flags are set to 0, while AF flag is undefined. There are 9 different opcodes for the TEST instruction depending on the
TEST_(x86_instruction)
Medical condition
compressive / bridge-type bands, adhesive / horse-strap bands, or have an undefined distribution. The bridge-type bands act as a barrier preventing the sciatic
Deep_gluteal_syndrome
This is a list of instruments by Hornbostel-Sachs number, covering those instruments that are classified under 32 under that system. This category includes
List of musical instruments by Hornbostel–Sachs number: 32
List_of_musical_instruments_by_Hornbostel–Sachs_number:_32
Shading language for WebGPU
for the web platform. WGSL was developed to be human-readable, avoid undefined behavior common in legacy shading languages, and align closely with WebGPU's
WebGPU_Shading_Language
Indian television actress
Retrieved 11 December 2021. "Paagalpan: Youthful, romantic, and fresh! | undefined Movie News - Times of India". The Times of India. 4 May 2001. Retrieved
Sambhavna_Seth
Value indicating that a referenced dataset is invalid or doesn't exist
pointers. It might do both at different times, or the comparison might be undefined behavior. Also, in languages offering such support, the correct use depends
Null_pointer
1939 novel by James Joyce
collective guilt of man." Fargnoli and Gillespie argue that although undefined, "Earwicker's alleged crime in the Park" appears to have been of a "voyeuristic
Finnegans_Wake
Medical condition
associated with H. pylori infection or chronic gastritis. The risk factors are undefined, except for rare inherited mutations in E-cadherin. The hereditary form
Linitis_plastica
LPH-5 analogue) – undefined mechanism of action and serotonergic hallucinogen – alcoholism – Lophora Lucid-PSYCH (Lucid-201) – undefined mechanism of action
List of investigational hallucinogens and entactogens
List_of_investigational_hallucinogens_and_entactogens
Mental illness with multiple personality states
diagnosed because of vague and unclear diagnostic criteria in the DSM and undefined concepts such as "personality state" and "identities", and question the
Dissociative identity disorder
Dissociative_identity_disorder
Real numbers with + and - infinity added
are either equal or both undefined. a + b {\displaystyle a+b} and b + a {\displaystyle b+a} are either equal or both undefined. a ⋅ ( b ⋅ c ) {\displaystyle
Extended_real_number_line
Character encoding of Latin script
é ê ë ì í î ï Fx ð ñ ò ó ô õ ö ÷ ø ù ú û ü ý þ ÿ Undefined Symbols and punctuation Undefined in the first release of ECMA-94 (1985). In the original
ISO/IEC_8859-1
C function to format and output text
between the format specifiers and count and type of values results in undefined behavior, and the program might crash or vulnerabilities may arise. The
Printf
Dairy based frozen confectionery
content would instead be considered "light ice cream"; a product with an undefined milk fat content would be defined simply as a "frozen dairy dessert".
Ice_milk
Investigational hair loss drugs
– intradermal – alopecia – undefined mechanism of action (polysaccharide) CKD-843 – oral, injection – alopecia – undefined mechanism of action CKR-051
List of investigational hair loss drugs
List_of_investigational_hair_loss_drugs
Condition of the wall of the intestine
Paraumbilical Femoral Obturator Spigelian Lumbar Petit's Grynfeltt–Lesshaft Undefined location Incisional Internal hernia Richter's Peritoneal Peritonitis Spontaneous
Diverticulosis
Investigational narcolepsy and hypersomnia drugs
receptor agonist – narcolepsy [17] Lu-AH69593 – undefined mechanism of action – narcolepsy [18] MK-6552 – undefined mechanism of action – narcolepsy [19] Sodium
List of investigational narcolepsy and hypersomnia drugs
List_of_investigational_narcolepsy_and_hypersomnia_drugs
Digestive disease of the large intestine
Paraumbilical Femoral Obturator Spigelian Lumbar Petit's Grynfeltt–Lesshaft Undefined location Incisional Internal hernia Richter's Peritoneal Peritonitis Spontaneous
Diverticulitis
City in Aleppo Governorate, Syria
Bernard; Holt, P. M. (eds.), The Cambridge History of Islam: Volume undefined: The Central Islamic Lands from Pre-Islamic Times to the First World War
Aleppo
Earth's southernmost continent
Claimant Territory Claim limits Map 1840 France Adélie Land Originally undefined; later specified to be 142°2′E to 136°11′E 1908 United Kingdom British
Antarctica
Measure of the asymmetry of random variables
distribution. The skewness value can be positive, zero, negative, or undefined. For a unimodal distribution (a distribution with a single peak), negative
Skewness
Multivalued function in mathematics
\end{aligned}}} (The last equation is more common in the literature but is undefined at x = 0). One consequence of this (using the fact that W0(e) = 1) is
Lambert_W_function
1964 aviation accident
Transports Aériens Registration F-BHMS Flight origin Undefined airport in Paris, France Stopover Undefined airport in Marseille, France 1st stopover Palma
1964 Alcazaba UTA Douglas DC-6 crash
1964_Alcazaba_UTA_Douglas_DC-6_crash
2021 video game
August 11, 2020, it was announced that the game had been delayed to an undefined date in 2021, due to a range of factors impacting development, including
Halo_Infinite
King of Macedon from 336 to 323 BC
Arachosia, Bactria, and Scythia. In 329 BC, Spitamenes, who held an undefined position in the satrapy of Sogdiana, betrayed Bessus to Ptolemy, one of
Alexander_the_Great
Inflammation of the stomach and small intestine
Paraumbilical Femoral Obturator Spigelian Lumbar Petit's Grynfeltt–Lesshaft Undefined location Incisional Internal hernia Richter's Peritoneal Peritonitis Spontaneous
Gastroenteritis
Medical condition with dark feces
Paraumbilical Femoral Obturator Spigelian Lumbar Petit's Grynfeltt–Lesshaft Undefined location Incisional Internal hernia Richter's Peritoneal Peritonitis Spontaneous
Melena
(the first use being in Genesis 10, in the Generations of Noah), with undefined boundaries and no meaningful description, and almost 200 of the remaining
Timeline of the name Palestine
Timeline_of_the_name_Palestine
UNDEFINED
UNDEFINED
UNDEFINED
UNDEFINED
Boy/Male
Irish
Champion; victorious.
Girl/Female
Indian, Sikh
Always Spread Love
Female
Finnish
Finnish name TAIMI means "sapling."
Girl/Female
Muslim
Falcon, Hawk (Garuda)
Girl/Female
Indian
This is also a male name
Boy/Male
Hindu, Indian
Man with Patience
Girl/Female
Teutonic American
noble.
Girl/Female
Norse
Divine strength.
Male
Egyptian
, Horus, Son of Isis.
Girl/Female
American, Assamese, Australian, British, Chinese, Christian, English, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Portuguese, Sanskrit, Sindhi, Tamil, Telugu
Gracious; Jehovah has been Gracious; Victory; God is Gracious
UNDEFINED
UNDEFINED
UNDEFINED
UNDEFINED
UNDEFINED
adv.
At a time undefined; once in a while; now and then; sometimes.
n.
The emotion inspired by something dreadful and sublime; an undefined sense of the dreadful and the sublime; reverential fear, or solemn wonder; profound reverence.
n.
Unlimited; not bounded or restricted; undefined.
v. t.
To reduce from a general, undefined, or comprehensive form, to particular or restricted form; to modify; to limit; to restrict; to restrain; as, to qualify a statement, claim, or proposition.
n.
Any portion of territory of undefined extent; a region; a country; a tract.
a.
Undefined; indefinite; not bounded by proper exceptions; as, unlimited terms.
n.
Undefined quantity; extent; degree.