x

I. noun (plural x's or xs) 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; x-ing or x'ing) 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