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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)
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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)
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)
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
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
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
Descriptive statistic
single measures, consistency undefined Two-way random, single score ICC(C,1) Two-way random, single measures, consistency undefined Two-way mixed, single score
Intraclass_correlation
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
↓
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
2026 video game
progression system additions are planned for Summer 2026. Additional undefined updates are planned for Winter 2026. Reception Kiln was released on April
Kiln_(video_game)
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
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
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
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
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
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
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
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
Concept in computer programming
catastrophic undefined behavior if they share state. This situation can arise in parallel computing, causing race conditions, but undefined behavior can
Sequence_point
Statement which ends execution of a function and resumes in the main code
returned when the return statement is omitted, while in JavaScript the value undefined is returned. In Windows PowerShell all evaluated expressions which are
Return_statement
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
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)
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
Type that allows only one value
In JavaScript, both Null (its only value is null) and Undefined (its only value is undefined) are built-in unit types. in Kotlin, Unit is a singleton
Unit_type
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
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
Travel document in Estonia
travel document that may be issued to a person who is stateless or of undefined citizenship residing in Estonia by the Police and Border Guard Board of
Estonian_alien's_passport
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
Chinese-administered area of Kashmir
Karakoram and Kuen Lun mountains) as a part of Kashmir under the caption "Undefined Frontier area". The northern border published by the 1954 Times Atlas
Trans-Karakoram_Tract
Arctangent function with two arguments
and y < 0 , + π 2 if x = 0 and y > 0 , − π 2 if x = 0 and y < 0 , undefined if x = 0 and y = 0. {\displaystyle \operatorname {atan2} (y,x)={\begin{cases}\arctan
Atan2
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
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
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
Address on the World Wide Web
scheme ":" ["//" authority] path ["?" query] ["#" fragment] A component is undefined if it has an associated delimiter and the delimiter does not appear in
URL
Angle of complex number about real axis
x<0} or undefined when x = 0 {\displaystyle x=0} . In Wolfram language, there's Arg[z]: Arg[x + y I] = { 0 if x = 0 and y = 0 , undefined if | x
Argument_(complex_analysis)
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)
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
Versions of a JavaScript standard
null or undefined. This contrasts with the || operator, which would return "string" for all "falsy" values, such as the ones below. undefined ?? "string"
ECMAScript_version_history
2025 American comedy-drama film
Lee of RogerEbert.com wrote: "Grooves with an improvised and charmingly undefined tempo. You can’t help but be enamored by its horrific, claustrophobic
The True Beauty of Being Bitten by a Tick
The_True_Beauty_of_Being_Bitten_by_a_Tick
C/C++ specifier referring to constant expression
relying on preprocessor directives, as well as preventing certain cases of undefined behavior. A variable or a variable template may be declared constexpr
Constexpr
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
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
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
Real estate valuation measure
income/cost = $100,000/ 0 → UNDEFINED Anybody who invests any amount of money at an undefined rate of return very quickly has an undefined percent return on his
Capitalization_rate
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
Input where a function output does not matter
address decoding Incomplete opcode decoding Logic redundancy Undefined behaviour Undefined variable Uninitialized variable Four-valued logic Nine-valued
Don't-care_term
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
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
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
Average value of a random variable
expectation of X {\displaystyle X} is undefined. Similarly, the Cauchy distribution, as discussed above, has undefined expectation. In the case of a non-negative
Expected_value
Esoteric programming language
representations of simple boolean or numeric values like "false", "true", "NaN", "undefined" with an indexer (a number in square brackets). Other tricks are needed
JSFuck
Legal case heard in the Federal Court of Australia
"biological" category, finding instead that "The word sex was, and remains, undefined in the SDA.", "sex is not confined to being a biological concept referring
Tickle_v_Giggle
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
Purposely unassigned Unicode code points
16 (U+F0000–U+FFFFD, U+100000–U+10FFFD). They are intentionally left undefined so that third parties may assign their own characters without conflicting
Private_Use_Areas
Machine instruction that indicates to a computer to do nothing
statement the same way as in the C and derivatives examples; Use the undefined or the null expression as a complete statement (an expression statement)
NOP_(code)
2024 survival horror game
PlayStation-esque visuals in a lot of indie horror titles is a testament to how undefined visuals can increase the fear factor." Henson added that the "loss of
Don't_Scream
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
Web browser bookmark containing JavaScript code
evaluates to the undefined type in JS. I added the void operator to JS before Netscape 2 shipped to make it easy to discard any non-undefined value in a javascript:
Bookmarklet
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
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
Object whose state cannot be modified after it is created
reachable from it cannot change (without breaking the type system, leading to undefined behavior). Any reference of that value must be marked const or immutable
Immutable_object
Investigational narcolepsy and hypersomnia drugs
receptor agonist – narcolepsy [16] Lu-AH69593 – undefined mechanism of action – narcolepsy [17] MK-6552 – undefined mechanism of action – narcolepsy [18] Sodium
List of investigational narcolepsy and hypersomnia drugs
List_of_investigational_narcolepsy_and_hypersomnia_drugs
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
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
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
Part of a computer program where a given name binding is valid
context that have undefined value differs: in Python use of undefined names yields a runtime error, while in JavaScript undefined names declared with
Scope_(computer_programming)
Indian politician
October 2022. Retrieved 26 January 2023. "Suhaib Alias Mannu Ansari: undefined Assembly Election Results Live, Candidates News, Videos, Photos". News18
Suhaib_Ansari
Canadian astrophysicist
that the evidence points to Jesus Christ as the designer, instead of an undefined intelligent designer. Hugh Ross was born in Montreal, Quebec, and raised
Hugh_Ross_(astrophysicist)
Gymnastics event in Santa Marta, Colombia
Senior Pan Ams conclude". USA Gymnastics. June 15, 2025. "FINAL - SENIOR - undefined - TEAM M" (PDF). FIG. June 14, 2025. "FINAL - ALL AROUND M - SENIOR" (PDF)
2025 Pan American Artistic Gymnastics Championships
2025_Pan_American_Artistic_Gymnastics_Championships
One of several equivalent definitions of a computable function
functions; for example, the minimisation of the successor function is undefined. The primitive recursive functions are a subset of the total recursive
General_recursive_function
Problem in finite group theory
in G undefined/does not halt if x = 1 in G {\displaystyle h(x)={\begin{cases}0&{\text{if}}\ x\neq 1\ {\text{in}}\ G\\{\text{undefined/does not
Word_problem_for_groups
Function whose actual domain of definition may be smaller than its apparent domain
Y} (it is a single element in Y), or f ( x ) {\displaystyle f(x)} is undefined. For example, if f {\displaystyle f} is the square root function restricted
Partial_function
Undefined point on a holomorphic function which can be made regular
singularity of a holomorphic function is a point at which the function is undefined, but it is possible to redefine the function at that point in such a way
Removable_singularity
Welsh rugby union player (born 1997)
new low". BBC Sport. 17 November 2024. Retrieved 7 December 2025. undefined, undefined. "Wales Squad for the 2025 Guinness Men's Six Nations | GM6N - Guinness
Aaron_Wainwright
Model of the extended complex plane plus a point at infinity
\infty -\infty } , and 0 × ∞ {\displaystyle 0\times \infty } are left undefined. Unlike the complex numbers, the extended complex numbers do not form
Riemann_sphere
System of geographic location identifiers
for other coordinates (of non-default CRS). The RFC explains that "... undefined <altitude> MAY assume that the URI refers to the respective location on
Geo_URI_scheme
Real numbers with an added point at infinity
of the binary arithmetic operations are total – for example, 0 ⋅ ∞ is undefined, even though the reciprocal is total. It has usable interpretations, however
Projectively extended real line
Projectively_extended_real_line
UNDEFINED
UNDEFINED
UNDEFINED
UNDEFINED
Boy/Male
English
Lives on the brook island.
Boy/Male
Indian, Kannada
Good Shiva Name
Girl/Female
Indian
A distinguished woman of her
Boy/Male
Hindu
Smile
Boy/Male
Hindu
Illumination
Boy/Male
Hindu, Indian
Fearless
Boy/Male
Tamil
Vajranakha | வாஜà¯à®°à®¨à®¾à®•à®¾Â
Strong nailed
Girl/Female
Indian, Russian
Active
Boy/Male
Hindu, Indian, Marathi, Telugu
The Karma we Perform in this Birth
Girl/Female
Indian, Malayalam
Vision
UNDEFINED
UNDEFINED
UNDEFINED
UNDEFINED
UNDEFINED
a.
Undefined; indefinite; not bounded by proper exceptions; as, unlimited terms.
n.
Unlimited; not bounded or restricted; undefined.
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.
Undefined quantity; extent; degree.
adv.
At a time undefined; once in a while; now and then; sometimes.
n.
Any portion of territory of undefined extent; a region; a country; a tract.
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.