- 1 [countable, uncountable] the 26th and last letter of the English alphabet “Zebra” begins with (a) Z/“Z.”
- 2 Z's [plural] (informal) (humorous) sleep I need to catch some Z's. Idioms
NAmE//zi//(pl. Zs, Z's, z's
including everything there is to know about something He knew his subject from A to Z.
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