Pronunciation: (zē or, esp. Brit., zed; Archaic iz'urd),[key] —n., —pl.Z's or Zs, z's or zs. 1. the 26th letter of the English alphabet, a consonant.
2. any spoken sound represented by the letter Z or z, as in zero, zigzag, or buzzer. 3. something having the shape of a Z. 4. a written or printed representation of the letter Z or z. 5. a device, as a printer's type, for reproducing the letter Z or z.
1. Astron.zenith distance.
—Symbol. 1. the 26th in order or in a series, or, when I is omitted, the 25th.
2. (sometimes l.c.) the medieval Roman numeral for 2000. Cf. Roman numerals. 3. Chem.,Physics.atomic number.
—Symbol,Math. 1. an unknown quantity or variable.
2. (in Cartesian coordinates) the z-axis.