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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
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
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)
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
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
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
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
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
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
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
Turkish television series
çekiliyor?". Habertürk (in Turkish). Retrieved 15 February 2026. Cite error: The named reference undefined was invoked but never defined (see the help page).
Taşacak_Bu_Deniz
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
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
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
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
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
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
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)
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
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
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
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
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
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)
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
↓
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
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
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)
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
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
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
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
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
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
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
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
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)
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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)
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
Investigational narcolepsy and hypersomnia drugs
receptor agonist – narcolepsy [18] Lu-AH69593 – undefined mechanism of action – narcolepsy [19] MK-6552 – undefined mechanism of action – narcolepsy [20] Sodium
List of investigational narcolepsy and hypersomnia drugs
List_of_investigational_narcolepsy_and_hypersomnia_drugs
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
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)
Italy international rugby union player
years 170 days.Fickou was 19 years and 3…" (Tweet) – via Twitter. undefined, undefined (5 April 2024). "ITALY'S MENONCELLO VOTED GUINNESS PLAYER OF THE
Tommaso_Menoncello
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)
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
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
Configuration file for computer networking
function assumes that the device has a single IPv4 address. The results are undefined if the device has more than one IPv4 address or has IPv6 addresses. Further
Proxy_auto-config
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
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
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
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
Presidential elections are expected to be held in Yemen at an undefined point in the future. President Abdrabbuh Mansur Hadi was elected for a two-year
Next Yemeni presidential election
Next_Yemeni_presidential_election
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
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)
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
Microprocessor instruction set
Shift and rotate instructions. SLL is an undefined instruction.
Z80_instruction_set
Javascript library
'library developer'}} find(people, {name: 'Walter'}); // undefined When the value is null or undefined, iteratee returns the identity function that Underscore
Underscore.js
Notation in organic chemistry for double bonds
E–Z configuration, or the E–Z convention, is the IUPAC's preferred method of describing the absolute stereochemistry of double bonds in organic chemistry
E–Z_notation
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
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
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
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
Inflammation of abdominal organ lining
Paraumbilical Femoral Obturator Spigelian Lumbar Petit's Grynfeltt–Lesshaft Undefined location Incisional Internal hernia Richter's Peritoneal Peritonitis Spontaneous
Peritonitis
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
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
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
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)
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
Inverse of the average of the inverses of a set of numbers
= undefined lim α → 1 H = lim β → ∞ H = 0 lim β → 0 H = lim α → ∞ H = 1 {\displaystyle {\begin{aligned}\lim _{\alpha \to 0}H&={\text{ undefined }}\\\lim
Harmonic_mean
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
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
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
team match results". ESPNcricinfo. Retrieved 17 May 2024. "Season wise undefined Match Result in Women's Premier League". ESPNcricinfo. Retrieved 17 May
List of Women's Premier League (cricket) seasons and results
List_of_Women's_Premier_League_(cricket)_seasons_and_results
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
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
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
UNDEFINED
UNDEFINED
UNDEFINED
UNDEFINED
Boy/Male
Hindu, Indian
Flow of Water
Boy/Male
Arabic
Helper; Assistant
Boy/Male
Tamil
Prasannatman | பà¯à®°à®¸à®‚நாதà¯à®®à®¾à®¨Â
Cheerful
Boy/Male
Hindu
One who has the skies as his clothes
Girl/Female
Arabic, Muslim
Gentle
Boy/Male
Hindu, Indian, Tamil, Telugu
A Person whose Eyes are in Brownish Like Cat Eyes; Male of Cat
Boy/Male
American, Anglo, Australian, British, English
From the Ledge Meadow; Clearing on a Bank
Surname or Lastname
North German
North German : habitational name from a place so named near Stettin.English : variant of Puck.
Boy/Male
Indian
One who cannot be injured, Rice offered to deity in Hindu Pooja, Indestructible
Boy/Male
Indian, Punjabi, Sikh
Lord's Flowers
UNDEFINED
UNDEFINED
UNDEFINED
UNDEFINED
UNDEFINED
n.
Unlimited; not bounded or restricted; undefined.
n.
Undefined quantity; extent; degree.
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.
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.
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.
a.
Undefined; indefinite; not bounded by proper exceptions; as, unlimited terms.