X - Definitions from Dictionary.com

20 results for: X

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X, x

–noun, plural X's or Xs, x's or xs.

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

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

3.	something having the shape of an X.

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

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

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Encyclopædia Britannica, Inc.
X

To learn more about X visit Britannica.com

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Audio Help [eks] Pronunciation Key

–verb (used with object), x-ed or x'd

Audio Help [ekst] Pronunciation Key, x-ing or x'ing

Audio Help [ek-sing] Pronunciation Key.

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

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

[Origin: 1840–50

]

Dictionary.com Unabridged (v 1.1)
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1.	experimental.

extra.

3.	extraordinary.

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Symbol.

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

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

Christ.

4.	Christian.

cross.

6.	Electricity. reactance.

7.	Slang. a ten-dollar bill.

8.	(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, See R (def. 5).

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

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

11.	Chemistry. (formerly) xenon.

Dictionary.com Unabridged (v 1.1)
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1.	ex¹ (def. 1).

excess.

Stock Exchange.

a.	(of stock trading) ex dividend.

b.	(of bond trading) ex interest.

4.	experimental.

extra.

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

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Symbol.

1.	an unknown quantity or a variable.

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

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

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

5.	power of magnification: a 50x telescope.

6.	(used as a signature by an illiterate person.)

cross.

8.	crossed with.

9.	(used to indicate a particular place or point on a map or diagram.)

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

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

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

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

14.	Chess. captures.

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

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

American Heritage Dictionary - Cite This Source - Share This

ab·scis·sa Audio Help (āb-sĭs'ə) Pronunciation Key

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n. Symbol x² pl. ab·scis·sas or ab·scis·sae (-sĭs'ē)
The coordinate representing the position of a point along a line perpendicular to the y-axis in a plane Cartesian coordinate system.

[New Latin (līnea) abscissa, (line) cut off, from Latin abscissa, feminine of abscissus, past participle of abscindere, to abscise; see abscise.]

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

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re·ac·tance Audio Help (rē-āk'təns) Pronunciation Key
n. Symbol X Electricity
Opposition to the flow of alternating current caused by the inductance and capacitance in a circuit rather than by resistance.

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

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x¹ or X Audio Help (ěks) Pronunciation Key
n. pl. x's or X's also xs or Xs

The 24th letter of the modern English alphabet.
Any of the speech sounds represented by the letter x.
The 24th in a series.
Something shaped like the letter X.
A mark inscribed to represent the signature of one who is unable to sign one's name.
An unknown or unnamed factor, thing, or person.

tr.v. x'd or X'd, x'ing or X'ing, x's or X's

To mark or sign with an X.
To delete, cancel, or obliterate with a series of X's. Often used with out.

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

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x²
The symbol for abscissa.

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X¹ Audio Help (ěks) Pronunciation Key
n. A movie rating indicating that admission will not be granted to anyone under the age of 17.

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X²

The symbol for reactance.
also x The symbol for the Roman numeral 10.

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X³
abbr.

Christ (Greek Χριστoς, Christos)
Christian
or x experimental
extra

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Online Etymology Dictionary - Cite This Source - Share This
X

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.

WordNet - Cite This Source - Share This

x
adjective
1.	being one more than nine [syn: ten]
noun
1.	the cardinal number that is the sum of nine and one; the base of the decimal system [syn: ten]
2.	the 24th letter of the Roman alphabet
3.	street names for methylenedioxymethamphetamine [syn: Adam]

Free On-line Dictionary of Computing - Cite This Source - Share This

X
1. Used in various speech and writing contexts (also in lowercase) in roughly its algebraic sense of "unknown within a set defined by context" (compare N). Thus, the abbreviation 680x0 stands for 68000, 68010, 68020, 68030 or 68040, and 80x86 stands for Intel 80186, Intel 80286, Intel 80386 or Intel 80486. A Unix hacker might write these as 680[0-4]0 and 80[1-4]86 or 680?0 and 80?86 respectively; see glob.
2. An alternative name for the X Window System.
3. A suffix for the speed of a CD-ROM drive relative to standard music CDs (1x). 32x is common in September 1999.
[The Jargon File]
(1999-09-15)

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Ex`po*nen"tial\, a. [Cf. F. exponentiel.] Pertaining to exponents; involving variable exponents; as, an exponential expression; exponential calculus; an exponential function.

Exponential curve, a curve whose nature is defined by means of an exponential equation.

Exponential equation, an equation which contains an exponential quantity, or in which the unknown quantity enters as an exponent.

Exponential quantity (Math.), a quantity whose exponent is unknown or variable, as a^x.

Exponential series, a series derived from the development of exponential equations or quantities.

American Heritage Abbreviations Dictionary 3rd Edition - Cite This Source - Share This

abscissa
by
times (that is, multiplication)

American Heritage Abbreviations Dictionary 3rd Edition - Cite This Source - Share This

adult audiences only
Christ
Christian
experimental
extra
reactance
10

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