Meaning of X in English

X

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

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.