(also z ) / zed; US ziː/ noun ( pl. Zs , Z's , z's / zedz; NAmE ziːz/)
1.
[ C , U ] the 26th and last letter of the English alphabet :
'Zebra' begins with (a) Z / 'Z'.
2.
Z's [ pl. ] ( NAmE , informal , humorous ) sleep :
I need to catch some Z's.
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IDIOMS
see A noun