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

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

something having the shape of an X.

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

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

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

to x out an error.

to indicate choice, as on a ballot or examination (often fol. by in )

to x in the candidate of your choice.

verb

annul , blot , cross , delete , efface , erase , expunge , obliterate , rub , scratch , strike , undo , wipe

noun

cross , letter , mark , signature , ten , times , unknown