Z

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.

Phrases

catch some (or a few) Zs N. Amer. informal get some sleep.

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Z²

abbreviation Zambia (international vehicle registration).

symbol Chemistry atomic number.