X (noun) Definition, Meaning & Examples

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verb (used with object), x-ed or x'd [ekst], /ɛkst/, x-ing or x'ing [ek-sing]. /ˈɛk sɪŋ/.
  1. to cross out or mark with or as if with an x (often followed by out): to x out an error.
  2. to indicate choice, as on a ballot or examination (often followed by in): to x in the candidate of your choice.
abbreviation
  1. ex1 (def. 1).
  2. excess.
  3. Stock Exchange.
  4. experimental.
  5. extra.
Symbol.
  1. an unknown quantity or a variable.
    • the letter x used to replace or obscure a gender morpheme, as to avoid the -o or -a inflection of a word borrowed from Spanish or the sequence m-e-n in the word women. See Latinx, womxn.
    • the letter x indicating a variable and used to hold a place in a word or abbreviation that can be occupied by another letter, as in CxO to account for a range of specialized executive positions in a corporation, for example CEO, CFO, and COO.
  3. (used at the end of letters, telegrams, etc., to indicate a kiss.)
  4. (used to indicate multiplication) times: 8 × 8=64.
  5. (used between figures indicating dimensions) by:3″ × 4″ (read: “three by four inches”);3″ × 4″ × 5″ (read: “three by four by five inches”).
  6. power of magnification: a 50x telescope.
  7. (used as a signature by an illiterate person.)
  8. cross.
  9. crossed with.
  10. (used to indicate a particular place or point on a map or diagram): X marks the spot where the pirates' treasure is buried.
  11. out of; foaled by: a colt by Flag-a-way x Merrylegs.
  12. (used to indicate choice, as on a ballot, examination, etc.)
  13. (used to indicate an error or incorrect answer, as on a test.)
  14. (in Cartesian coordinates) the x-axis.
  15. captures.
  16. a person, thing, agency, factor, etc., of unknown identity: I feel sorry for poor Mr. X, the man she will ultimately marry.
noun, plural X's or Xs, x's or xs.
  1. the 24th letter of the English alphabet, a consonant.
  2. any spoken sound or combination of sounds represented by the letter X or x, as in xylene, box, or exact.
  3. something having the shape of an X.
  4. a written or printed representation of the letter X or x.
  5. a device, as a printer's type, for reproducing the letter X or x.
abbreviation
  1. experimental.
  2. extra.
  3. extraordinary.
Symbol.
  1. the 24th in order or in a series.
  2. the Roman numeral for 10.
  3. Christ.
  4. Christian.
  5. cross.
  6. reactance (def. 1).
  7. a ten-dollar bill.
  8. (no longer in official use by the Motion Picture Association of America) a rating for movies with subject matter that is suitable for adults only.
  9. (in Great Britain) a designation for a film recommended for adults only.
  10. a person, thing, agency, factor, etc., of unknown identity.
  11. (formerly) xenon.
noun plural x's, X's or Xs
  1. the 24th letter and 19th consonant of the modern English alphabet
  2. a speech sound sequence represented by this letter, in English pronounced as ks or gz or, in initial position, z, as in xylophone
symbol for
  1. ex
  2. the x- axis or a coordinate measured along the x- axis in a Cartesian coordinate system
  3. an algebraic variable
symbol for
  1. (formerly, in Britain)
    • indicating a film that may not be publicly shown to anyone under 18. Since 1982 replaced by symbol 18
    • (as modifier)
  2. denoting any unknown, unspecified, or variable factor, number, person, or thing
  3. (on letters, cards, etc) denoting a kiss
  4. (on ballot papers, etc) indicating choice
  5. (on examination papers, etc) indicating error
  6. for Christ; Christian
  7. ten
X (noun) Definition, Meaning & Examples

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