z-axis

American  

[zee-ak-sis] / ˈziˌæk sɪs /

noun

Mathematics.

z-axes plural

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.

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z-axis British  

noun

1. a reference axis of a three-dimensional Cartesian coordinate system along which the z- coordinate is measured

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z-axis Scientific  

/ zē′ăk′sĭs /

1. One of the three axes of a three-dimensional Cartesian coordinate system.

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Other Word Forms

Inflected Forms

noun

• z-axes
  plural

Etymology

Origin of z-axis

First recorded in 1945–50

Example Sentences

He had spent his life building a planar model of his ascent to the presidency, only to get whacked in the head by an unforeseen z-axis.

From Slate • Sep. 27, 2025

To obtain a parameterization, let α be the angle that is swept out by starting at the positive z-axis and ending at the cone, and let k = tan α.

From Textbooks • Mar. 30, 2016

The field is rotational in nature and, for a given circle parallel to the xy-plane that has a center on the z-axis, the vectors along that circle are all the same magnitude.

From Textbooks • Mar. 30, 2016

Therefore, the lines composing this surface are parallel to the z-axis.

From Textbooks • Mar. 30, 2016

To represent equations involving three unknowns x, y, z, a third axis is introduced, the z-axis, perpendicular to the plane xy and passing through the intersection of the lines x, y.

From Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 7 "Equation" to "Ethics" by Various