noun. The 26th letter of the modern English alphabet.

noun. Any of the speech sounds represented by the letter z.

noun. The 26th in a series.

noun. Something shaped like the letter Z.

noun. Sleep.

noun. In astronomy, an abbreviation of Zonæ Cordobenses, Gould's Cordova Zones. See C. Z.

noun. An abbreviation of Zoölogical Garden or Gardens.

The twenty-sixth character in the English alphabet, and the last, as in that of the later Romans.

As a symbol, in mathematics:

[lowercase] In algebra, the third variable or unknown quantity.

[lowercase] In analytical geometry, one of the system of point-coördinates in space.

In mechanics, the component of a force in the direction of the axis of z.

Z, the twenty-sixth and last letter of the English alphabet, is a vocal consonant. It is taken from the Latin letter Z, which came from the Greek alphabet, this having it from a Semitic source. The ultimate origin is probably Egyptian. Etymologically, it is most closely related to s, y, and j; as in glass, glaze; E. yoke, Gr. �, L. yugum; E. zealous, jealous. See Guide to Pronunciation, §§ 273, 274.

noun. The twenty-sixth letter of the basic modern Latin alphabet.

noun. Symbol for the prefix zepto-.

noun. Symbol for the redshift.

noun. Used to denote a real variable when x and y are already in use.

noun. Used to denote the third coordinate in three-dimensional Cartesian and cylindrical coordinate systems.

noun. Used to denote a complex variable.

noun. Used to denote a value of a standard normal random variable.

noun. Quantity along the third axis in a three-dimensional system, vertical when applicable.

noun. Symbol for atomic number.

noun. voiced alveolar fricative

noun. The twenty-sixth letter of the English alphabet, called zed or zee and written in the Latin script.

noun. the ending of a series or sequence

noun. the 26th letter of the Roman alphabet