noun, plural X's or Xs, x's or xs.
verb (used with object), x-ed or x'd [ekst] /ɛkst/, x-ing or x'ing [ek-sing] /ˈɛk sɪŋ/.
Origin of x
noun, plural chis.
Origin of chi1
Examples from the Web for x
Contemporary Examples of x
“Getting out of X band is on option,” said one senior Air Force official.Pentagon Worries That Russia Can Now Outshoot U.S. Stealth Jets
December 4, 2014
His company names all ended in an X—EBX, OGX, MMX—because in numerology, X stands for the multiplication of wealth.The Zillionaires Who Lost Everything
October 26, 2014
X was then warned of the near miss via a correspondent who had worked with him in the past.
He said that he had secured the fixer, ‘X,’ through a fellow Western journalist, and not by writing to 30 Syrians via Facebook.
X and Y could be terrible on their own, unknowable terms, and therefore incomparable.Atheist King Richard Dawkins’ Rape Fantasy
July 31, 2014
Historical Examples of x
The curve is symmetrical about the axis of y and has the axis of x for its asymptote.
It was "X," and enough negative acceleration was applied to make an easy landing possible.Skylark Three
Edward Elmer Smith
All these words are merely our puny euphemisms for X, the unknown quantity.
In the room marked "X" on this Exhibit No. 701 is where he was?Warren Commission (4 of 26): Hearings Vol. IV (of 15)
The President's Commission on the Assassination of President Kennedy
From x-, prefix denoting feminine gender; kan, yellow; lox, to strike with the closed fist.Reports on the Maya Indians of Yucatan
noun plural x's, X's or Xs
- indicating a film that may not be publicly shown to anyone under 18. Since 1982 replaced by symbol 18
- (as modifier)an X film
Word Origin for X
ch'i or qi
Word Origin for chi
most English words beginning in -x- are of Greek origin or modern commercial coinages. East Anglian in 14c. showed a tendency to use -x- for initial sh-, sch- (cf. xal for shall), which didn't catch on but seems an improvement over the current system. As a symbol of a kiss on a letter, etc., it is recorded from 1765. In malt liquor, XX denoted "double quality" and XXX "strongest quality" (1827).
Algebraic meaning "unknown quantity" (1660 in English), sometimes said to be from medieval use, originally a crossed -r-, probably from Latin radix (see root (n.)). Other theories trace it to Arabic, but a more prosaic explanation says Descartes (1637) took x, y, z, the last three letters of the alphabet, for unknowns to correspond to a, b, c, used for known quantities.
Used allusively for "unknown person" from 1797, "something unknown" since 1859. As a type of chromosome, attested from 1902 (first so called in German; Henking, 1891). First used 1950 in Britain to designate "films deemed suitable for adults only;" adopted in U.S. Nov. 1, 1968.
22nd letter of the Greek alphabet, representing a -kh- sound (see ch). The letter is shaped like an X, and so the Greek letter name was used figuratively to signify such a shape or arrangement (e.g. khiasma "two things placed crosswise;" khiastos "arranged diagonally; marked with an X;" khiazein "to mark with an 'X', to write the letter 'X'"). Some dialects used chi to represent the -ks- sound properly belonging to xi; Latin picked this up and the sound value of chi in Latin-derived alphabets is now that of English X.