/eks/ , n. , pl. 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.