rotation axis

noun Crystallography.
  1. an imaginary line through a crystal about which the crystal may be rotated a specified number of degrees and be brought back to its original position.

Origin of rotation axis

First recorded in 1900–05
Also called axis of symmetry, symmetry axis of rotation.

rotation of axes

[ak-seez]
noun Mathematics.
  1. a process of replacing the axes in a Cartesian coordinate system with a new set of axes making a specified angle with and having the same origin as the original axes.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018