Z 1 [ zɛd , US zi: ]
(also z )
■ noun ( plural Zs or Z's )
1》 the twenty-sixth letter of the alphabet.
2》 denoting the next after Y in a set of items, categories, etc.
3》 (usu. z ) the third unknown quantity in an algebraic expression.
↘denoting the third axis in a three-dimensional system of coordinates.
4》 used in repeated form to represent buzzing or snoring.
Phrases
catch some (or a few ) Zs N. Amer. informal get some sleep.
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Z 2
■ abbreviation Zambia (international vehicle registration).
■ symbol Chemistry atomic number.