Meaning of z-axis

z-ax•is

Pronunciation: (zē'ak"sis), [key]
— pl. z-ax•es
  1. (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.
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