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2017 Word of the Year

axis of symmetry

noun
1.
Mathematics. a straight line for which every point on a given curve has corresponding to it another point such that the line connecting the two points is bisected by the given line.
2.
Crystallography. rotation axis.
Origin of axis of symmetry
1875-1880
First recorded in 1875-80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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