X, x

[ eks ]

/ ɛks /

noun, plural X's or Xs, x's or xs.

the 24th letter of the English alphabet, a consonant.

any spoken sound or combination of sounds represented by the letter X or x, as in xylene, box, or exact.

something having the shape of an X.

a written or printed representation of the letter X or x.

a device, as a printer's type, for reproducing the letter X or x.

Definition for x (2 of 7)

x ¹

[ eks ]

/ ɛks /

verb (used with object), x-ed or x'd [ekst] /ɛkst/, x-ing or x'ing [ek-sing] /ˈɛk sɪŋ/.

to cross out or mark with or as if with an x (often followed by out): to x out an error.

to indicate choice, as on a ballot or examination (often followed by in): to x in the candidate of your choice.

Origin of x

First recorded in 1840–50

Definition for x (3 of 7)

x ²

abbreviation

ex¹(def 1).

excess.

Stock Exchange.

(of stock trading) ex dividend.
(of bond trading) ex interest.

experimental.

extra.

Definition for x (4 of 7)

x ³

Symbol.

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.

(used at the end of letters, telegrams, etc., to indicate a kiss.)

(used to indicate multiplication) times: 8 × 8=64.

(used between figures indicating dimensions) by: 3″ × 4″ (read: “three by four inches”); 3″ × 4″ × 5″ (read: “three by four by five inches”).

power of magnification: a 50x telescope.

(used as a signature by an illiterate person.)

cross.

crossed with.

(used to indicate a particular place or point on a map or diagram): X marks the spot where the pirates' treasure is buried.

out of; foaled by: a colt by Flag-a-way x Merrylegs.

(used to indicate choice, as on a ballot, examination, etc.)

(used to indicate an error or incorrect answer, as on a test.)

Mathematics. (in Cartesian coordinates) the x-axis.

Chess. captures.

a person, thing, agency, factor, etc., of unknown identity: I feel sorry for poor Mr. X, the man she will ultimately marry.

Definition for x (5 of 7)

experimental.

extra.

extraordinary.

Definition for x (6 of 7)

Symbol.

the 24th in order or in a series, or, when I is omitted, the 23rd.

(sometimes lowercase) the Roman numeral for 10. Compare Roman numerals.

Christ.

Christian.

cross.

Electricity. reactance.

Slang. a ten-dollar bill.

(in the U.S.) a rating of the Motion Picture Association of America for movies with subject matter that is suitable for adults only: persons who are under age (usually 17) will not be admitted. Compare G(def 7), PG, PG-13, R¹.

(in Great Britain) a designation for a film recommended for adults only. Compare A(def 11), AA(def 5), U(def 6).

a person, thing, agency, factor, etc., of unknown identity.

Chemistry. (formerly) xenon.

Definition for x (7 of 7)

chi ¹

[ kahy ]

/ kaɪ /

noun, plural chis.

the twenty-second letter of the Greek alphabet (X, χ).

the consonant sound represented by this letter.

Origin of chi

From Greek

Example sentences from the Web for 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 |Dave Majumdar |December 4, 2014 |DAILY BEAST
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 |Tom Sykes |October 26, 2014 |DAILY BEAST
X was then warned of the near miss via a correspondent who had worked with him in the past.

Was U.S. Journalist Steven Sotloff a Marked Man? |Ben Taub |September 2, 2014 |DAILY BEAST
He said that he had secured the fixer, ‘X,’ through a fellow Western journalist, and not by writing to 30 Syrians via Facebook.

Was U.S. Journalist Steven Sotloff a Marked Man? |Ben Taub |September 2, 2014 |DAILY BEAST

X and Y could be terrible on their own, unknowable terms, and therefore incomparable.

Atheist King Richard Dawkins’ Rape Fantasy |Tim Teeman |July 31, 2014 |DAILY BEAST
The curve is symmetrical about the axis of y and has the axis of x for its asymptote.

Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 |Various
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.

The Scrap Book. Volume 1, No. 2 |Various
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 |Santiago Mendez

British Dictionary definitions for x (1 of 5)

X

/ (ɛks) /

noun plural x's, X's or Xs

the 24th letter and 19th consonant of the modern English alphabet

a speech sound sequence represented by this letter, in English pronounced as ks or gz or, in initial position, z, as in xylophone

British Dictionary definitions for x (2 of 5)

symbol for

commerce banking finance ex

maths the x- axis or a coordinate measured along the x- axis in a Cartesian coordinate system

an algebraic variable

British Dictionary definitions for x (3 of 5)

symbol for

(formerly, in Britain)

indicating a film that may not be publicly shown to anyone under 18. Since 1982 replaced by symbol 18
(as modifier)an X film

denoting any unknown, unspecified, or variable factor, number, person, or thing

(on letters, cards, etc) denoting a kiss

(on ballot papers, etc) indicating choice

(on examination papers, etc) indicating error

for Christ; Christian

(Roman numeral) ten See Roman numerals

Word Origin for X

(sense 6) from the form of the Greek letter khi (Χ), first letter of Khristos Christ

British Dictionary definitions for x (4 of 5)

chi ¹

/ (kaɪ) /

noun

the 22nd letter of the Greek alphabet (Χ, χ), a consonant, transliterated as ch or rarely kh

British Dictionary definitions for x (5 of 5)

chi ²

ch'i or qi

/ (tʃiː) /

noun

(sometimes capital) (in Oriental medicine, martial arts, etc) vital energy believed to circulate round the body in currents

Word Origin for chi

Chinese, literally: energy

BROWSE DICTIONARY

Learning

X, x

noun, plural X's or Xs, x's or xs.

Definition for x (2 of 7)

verb (used with object), x-ed or x'd [ekst] /ɛkst/, x-ing or x'ing [ek-sing] /ˈɛk sɪŋ/.

Origin of x

Definition for x (3 of 7)

abbreviation

Definition for x (4 of 7)

Symbol.

Definition for x (5 of 7)

Definition for x (6 of 7)

Symbol.

Definition for x (7 of 7)

noun, plural chis.

Origin of chi

Example sentences from the Web for x

British Dictionary definitions for x (1 of 5)

X

noun plural x's, X's or Xs

British Dictionary definitions for x (2 of 5)

symbol for

British Dictionary definitions for x (3 of 5)

symbol for

Word Origin for X

British Dictionary definitions for x (4 of 5)

noun

British Dictionary definitions for x (5 of 5)

ch'i or qi

noun

Word Origin for chi

BROWSE DICTIONARY

Learning

X, x

noun, plural X's or Xs, x's or xs.

Definition for x (2 of 7)

verb (used with object), x-ed or x'd [ekst] /ɛkst/, x-ing or x'ing [ek-sing] /ˈɛk sɪŋ/.

Origin of x

Definition for x (3 of 7)

abbreviation

Definition for x (4 of 7)

Symbol.

Definition for x (5 of 7)

Definition for x (6 of 7)

Symbol.

Definition for x (7 of 7)

noun, plural chis.

Origin of chi

Content related to x

Words related to x

Example sentences from the Web for x

British Dictionary definitions for x (1 of 5)

X

noun plural x's, X's or Xs

British Dictionary definitions for x (2 of 5)

symbol for

British Dictionary definitions for x (3 of 5)

symbol for

Word Origin for X

British Dictionary definitions for x (4 of 5)

noun

British Dictionary definitions for x (5 of 5)

ch'i or qi

noun

Word Origin for chi