I. ˈeks noun
( plural x's or xs ˈek-səz)
Usage: often capitalized, often attributive
Date: before 12th century
1.
a. : the 24th letter of the English alphabet
b. : a graphic representation of this letter
c. : a speech counterpart of orthographic x
2. : ten — see number table
3. : a graphic device for reproducing the letter x
4. : one designated x especially as the 24th in order or class, or the first in an order or class that includes x, y, and sometimes z
5. : an unknown quantity
6. : something shaped like or marked with the letter X
II. transitive verb
( x-ed also x'd or xed ˈekst ; x-ing or x'ing ˈek-siŋ)
Date: circa 1849
1. : to mark with an x
2. : to cancel or obliterate with a series of x 's — usually used with out
x-ed out the mistake
III. abbreviation
1. cross
2. ex
3. experimental
4. extra