X
Pronuctuation
- IPA: /ɛks/
- Rhymes: -ɛks
Etymology 1
Cardinal number
X- 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
Derived terms
- (signature mark) xoxo
Etymology 3
Presumably by abbreviation of the pronunciation of ecstasy.
Etymology 4
Adjective
X
- (Former British film certificate) Suitable only for those aged 16 or (later) 18 years and over.
- (movie rating) Obscene.
Etymology 5
From Christ by abbreviation, from Ancient Greek Χ (Ch, "(letter chi)"), from ΧÏιστός (Christós, "Christ").
Etymology 6
{{abbreviation-old|en}}
X
(plural Xes)- (North America) cross, crossing
- intersex or transgender passports and identification documents
Derived terms
Etymology 7
As defined in CIE 1931 color space.
Noun
X
(uncountable)- 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.