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rotation axis

noun, Crystallography.
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.
Also called axis of symmetry, symmetry axis of rotation.
Compare symmetry element.
Origin of rotation axis
First recorded in 1900-05

rotation of axes

[ak-seez] /ˈæk siz/
noun, Mathematics.
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. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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