- X, x
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/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.
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Universalium. 2010.