z

UK: 'Z', 'z': /ˈzɛd/

US: 'Z', 'z': /zi/

US: 'Z', 'z': (zē or, esp. Brit., zed; Archaic iz′ərd)

Collins Concise English Dictionary © HarperCollins Publishers::

z, Z / zɛd ziː/ noun (z's, Z's, Zs)

1. the 26th and last letter and the 20th consonant of the modern English alphabet
2. a speech sound represented by this letter, in English usually a voiced alveolar fricative, as in zip
3. something shaped like a Z
4. (in combination): a Z-bend in a road

z symbol

1. the z-axis or a coordinate measured along the z-axis in a Cartesian or cylindrical coordinate system
2. an algebraic variable

WordReference Random House Learner's Dictionary of American English © 2025

Z, z /zi/   n. [countable] , pl. Zs or Z's, zs or z's. 

1. the 26th letter of the English alphabet, a consonant.

WordReference Random House Unabridged Dictionary of American English © 2025

Z, z  (zē or, esp. Brit., zed; Archaic iz′ərd), 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 aZ.
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.

Z, 

1. Astronomy zenith distance.
2. zone.

Z,  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.
4. [Elect.] impedance.

z, 

1. zone.

z, [Symbol, Math.]

1. an unknown quantity or variable.
2. (in Cartesian coordinates) the z- axis.

z., 

1. Mathematics zero.

Z⁰, 

1. [Symbol, Physics.] See Z-zero particle. 

Collins Concise English Dictionary © HarperCollins Publishers::

Z symbol

1. any unknown, variable, or unspecified factor, number, person, or thing
2. atomic number
3. impedance
4. zone