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2017 Word of the Year

planetary precession

noun, Astronomy.
1.
the small component of the precession of the equinoxes contributed by the motion of the ecliptic, the change in orientation of the plane of the earth's orbit being produced by the gravitational attraction of the planets.
Origin of planetary precession
1860-1865
First recorded in 1860-65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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