Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 n. The 26th letter of the modern English alphabet.
 n. Any of the speech sounds represented by the letter z.
 n. The 26th in a series.
 n. Something shaped like the letter Z.
 n. Slang Sleep.
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. The twentysixth letter of the basic modern Latin alphabet.
 n. Symbol for the prefix zepto.
 n. Symbol for the redshift.
 n. Used to denote a real variable when x and y are already in use.
 n. Used to denote the third coordinate in threedimensional Cartesian and cylindrical coordinate systems.
 n. Used to denote a complex variable.
 n. Used to denote a value of a standard normal random variable.
 n. Quantity along the third axis in a threedimensional system, vertical when applicable.
 n. Symbol for atomic number.
 n. voiced alveolar fricative
 n. The twentysixth letter of the English alphabet, called zed or zee and written in the Latin script.
from the GNU version of the Collaborative International Dictionary of English
 Z, the twentysixth 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.
from The Century Dictionary and Cyclopedia
 n. In astronomy, an abbreviation of Zonæ Cordobenses, Gould's Cordova Zones. See C. Z.
 n. An abbreviation of Zoölogical Garden or Gardens.
 The twentysixth 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 pointcoördinates in space.
 In mechanics, the component of a force in the direction of the axis of z.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 n. the ending of a series or sequence
 n. the 26th letter of the Roman alphabet
Etymologies
Sorry, no etymologies found.
Examples

For example, all pronouns like first person *zō violate markedness because plain *z is so rare in his convoluted phonology while palatal *ź is used to explain almost everything see his list of 'z words' here where his diacritic bias is selfevident.

Let x, y, z, and t denote the coordinates and syn  chronized clock times used by E in his spaceship refer  ence frame S; and let x′, y′, z′, and t′ denote the corre  sponding quantities used by E′ in S′.

Z z z z! as I ducked to the saddlebow, and something scraped across my back with a sound as of rending garments.
The Idler Magazine, Volume III, April 1893 An Illustrated Monthly

W + x + y + z = 4 (6) and W² + x² + y² + z² = 1 (7) are equations in which their number is four.

I think it's S, z, c, z _ [Lina gives him her visitingcard].

She reeled in, slowly and steadily for a moment, and then, whiz  z z! off he dashed again.

When the triangle _a z n_, by settling, drives backwards the 2/3 of each 1/2 circle that is _a s_ and in the same way _z m_, the reason is that _a_ is perpendicularly over _b_ and so likewise _z_ is above

Slide 50: The Formula zi+1 = zi2 + c (1) where z0: = 0 + 0i c: = x + yi for every pixel: z →0⇒z ∈ M z → ∞ ⇒z ∈ M /

& Estimate & Std. Error & z value & Pr ($ > $$  $z$  $) \\

CA's Wily APM software already provides support for managing mission critical applications running on distributed and mainframe systems, including z/OS® and Linux® on System z®, and the ability to monitor transactions across these environments.
thesaraheffect commented on the word z
Pronunciation?
September 19, 2009
artoparts commented on the word z
zulu time  We should arrive there at 1700Z today. The Z means Zulu which means UTC which means Universal Time Coordinated which means Greenwich Mean Time GMT.
July 24, 2009