/ Dictionary / Index Z z-axis: Meaning and Definition of Find definitions for: z-ax•is Pronunciation: (zē'ak"sis), [key] — pl. z-ax•es (in a three-dimensional Cartesian coordinate system) the axis along which values of z are measured and at which both x and y equal zero. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: z-axis (Thesaurus) zax Zaydi Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language