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2017 Word of the Year

apsidal motion

noun, Astronomy.
1.
the rotation of the major axis of an eccentric orbit in the plane of the orbit.
Origin of apsidal motion
1955-1960
First recorded in 1955-60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Word Value for apsidal

10
12
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