crossing (used especially on road signs): deer Xing; school Xing.
Also, XING, xing. Unabridged


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

1840–50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
x or X (ɛks)
n , pl x's, X's, Xs
1.  the 24th letter and 19th consonant of the modern English alphabet
2.  a speech sound sequence represented by this letter, in English pronounced as ks or gz or, in initial position, z, as in xylophone
X or X

symbol for
1.  commerce, banking, finance ex
2.  maths the x-axis or a coordinate measured along the x-axis in a Cartesian coordinate system
3.  an algebraic variable

symbol for
1.  formerly, in Britain
 a.  indicating a film that may not be publicly shown to anyone under 18. Since 1982 replaced by symbol 18
 b.  (as modifier): an X film
2.  denoting any unknown, unspecified, or variable factor, number, person, or thing
3.  (on letters, cards, etc) denoting a kiss
4.  (on ballot papers, etc) indicating choice
5.  (on examination papers, etc) indicating error
6.  for Christ; Christian
7.  Roman numeral See Roman numerals ten
[(sense 6) from the form of the Greek letter khi (Χ), first letter of Khristos Christ]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

most Eng. words beginning in -x- are of Gk. origin or modern commercial coinages. E. 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 Eng.), sometimes said to be from medieval use, originally a crossed -r-, probably from L. radix (see root). 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 used 1950 in Britain to designate "films deemed suitable for adults only;" adopted in U.S. Nov. 1, 1968.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
  1. abscissa

  2. by

  3. times (that is, multiplication)

  1. adult audiences only

  2. Christ

  3. Christian

  4. experimental

  5. extra

  6. reactance

  7. 10

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Related Words
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