• X

    Pronuctuation

    • IPA: /É›ks/
    • Rhymes: -É›ks

    Etymology 1

    Cardinal number

    X
    1. An unknown quantity or unknown value.

    Pronuctuation

    • IPA: /ks/, IPA: /É¡z/, or at the beginning of words IPA: /z/.

    Etymology 2

    Full definition of X

    Letter

    Noun

    noun

    1. Any mark that looks like that letter, such as such a mark made by a person who cannot read or write, in lieu of a signature.
    2. (lacrosse) The spot behind the goal.

    Derived terms

    • (signature mark) xoxo

    Etymology 3

    Presumably by abbreviation of the pronunciation of ecstasy.

    Noun

    X

    (uncountable)
    1. (slang) Ecstasy, a particular street drug.

    Etymology 4

    Adjective

    X

    1. (Former British film certificate) Suitable only for those aged 16 or (later) 18 years and over.
    2. (movie rating) Obscene.

    Etymology 5

    From Christ by abbreviation, from Ancient Greek Χ (Ch, "(letter chi)"), from Χριστός (Christós, "Christ").

    {{abbreviation-old|en}}

    X

    (plural Xs)
    1. (informal) Christ

    Derived terms

    Etymology 6

    From cross, due to the X symbol being a cross saltire.

    {{abbreviation-old|en}}

    X

    (plural Xes)
    1. (North America) cross, crossing
    2. intersex or transgender passports and identification documents

    Derived terms

    Etymology 7

    As defined in CIE 1931 color space.

    Noun

    X

    (uncountable)
    1. One of the tristimulus values which, with Y and Z, defines coordinates in a three-dimensional color space. Pronounced big X or cap X.
      • 2003, Charles A. Poynton, Digital Video and HDTV: Algorithms and Interfaces, ISBN 9781558607927, p. 217:X, Y and Z are pronounced big-X, big-Y, and big-Z, or cap-X, cap-Y, and cap-Z, to distinguish them from little x and little y, to be described in a moment.
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