Z1 [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.
catch some (or a few) Zs N. Amer. informal get some sleep.
abbreviation Zambia (international vehicle registration).
symbol Chemistry atomic number.

English new terms dictionary. 2014.

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