X meaning: Variable representing an unknown value

We found 12 dictionaries that define the word x:

General (5 matching dictionaries)

-x: Oxford Learner's Dictionaries
-x: Wordnik
-X, -x: Wiktionary
X(ALPHA), X(T): Dictionary.com
The X (radio), The X, The x, X (Agnez Mo album), X (Album), X (Alphabet Inc.), X (American band), X (Australian band), X (Chris Brown album), X (Chris Brown song), X (Cyrillic), X (Dark Horse Comics), X (Def Leppard album), X (Ed Sheeran album), X (Fourplay album), X (Game Boy game), X (Gnags album), X (INXS album), X (K-Ci & JoJo album), X (Klaus Schulze album), X (Kylie Minogue album), X (Liberty X album), X (Liberty X song), X (Lucki mixtape), X (Nicky Jam and J Balvin song), X (No Absolutes), X (Nonpoint album), X (Poppy song), X (Roll Deep album), X (Royal Hunt album), X (Spock's Beard album), X (The X-Files), X (Trace Adkins album), X (Tribal Tech album), X (U.S. band), X (Xbox show), X (Xzibit song), X (anime), X (band), X (charge), X (company), X (demo party), X (demoparty), X (disambiguation), X (game series), X (handheld game), X (magazine), X (manga), X (math), X (movie), X (novel), X (radio), X (roller coaster), X (video game series), .x: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)

X (window system): Encyclopedia

Medicine (2 matching dictionaries)

X (drug caution code), X (in genetics): MedTerms.com Medical Dictionary
X (drug caution code), X (in genetics): Drug Medical Dictionary

Miscellaneous (2 matching dictionaries)

X(ALPHA), X(T): Acronym Finder
AbbreviationZ (No longer online)

Slang (2 matching dictionaries)

x, x, x, x, x, x, X, X, X, X: Green’s Dictionary of Slang
x-/, the x: Urban Dictionary

(Note: See x'd as well.)

Google, News, Wikipedia, Reddit, X, BlueSky, Kagi

Definitions from Wiktionary (X)

▸ noun:  A placeholder for an unknown, suppressed or hypothetical name.
▸ noun:  (anthroponymy, politics) A surname, used by those who have had their identity or heritage, including their proper ancestral names, erased or forgotten.
▸ noun:  Any mark that looks like that letter, such as a mark made by a person who cannot read or write in lieu of a signature.
▸ noun:  (lacrosse) The spot behind the goal.
▸ adjective:  Intersex or non-binary (in passports and identification documents).
▸ noun:  (slang) Ecstasy, a particular street drug.
▸ adjective:  (British film certificate, dated) Suitable only for those aged 16 or (later) 18 years and over.
▸ adjective:  (movie rating) Obscene.
▸ noun:  (informal) Christ
▸ noun:  (Canada, US) Cross, crossing.
▸ adjective:  (informal) Abbreviation of extreme. [Of a place, the most remote, farthest or outermost.]
▸ adjective:  Alternative letter-case form of X (“intersex or non-binary, in passports and identification documents”) [Intersex or non-binary (in passports and identification documents).]

Opposite:

inverse, reciprocal

Phrases:

x ray, X chromosome, x rays, x axis, fragile X syndrome, more...

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