n. (also z) (pl. Zs or Z's) 1 the twenty-sixth letter of the alphabet. 2 (usu. z) Algebra the third unknown quantity. 3 Geom. the third coordinate. 4 Chem. atomic number.
Z
Meaning of Z in English
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012