X

Pronuctuation

• IPA: /É›ks/
• Rhymes: -É›ks

Cardinal number

1. An unknown quantity or unknown value.

Pronuctuation

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

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

Presumably by abbreviation of the pronunciation of ecstasy.

Noun

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

Adjective

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

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

{{abbreviation-old|en}}

1. (informal) Christ

Derived terms

• Xianity
• Xmas
• Xtopher rare

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

{{abbreviation-old|en}}

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

Derived terms

• xing

As defined in CIE 1931 color space.

Noun

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.

Derived terms

• X marks the spot
• XXX
• XXXX