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evection

[ih-vek-shuh n] /ɪˈvɛk ʃən/
noun, Astronomy
1.
a periodic irregularity in the moon's motion, caused by the attraction of the sun.
Origin
1650-1660
1650-60; < Latin ēvectiōn- (stem of ēvectiō) a going upwards, flight, equivalent to ēvect(us) (past participle of ēvehere to carry forth, move forth) + -iōn- -ion
Related forms
evectional, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for evection

evection

/ɪˈvɛkʃən/
noun
1.
irregularity in the moon's motion caused by perturbations of the sun and planets
Derived Forms
evectional, adjective
Word Origin
C17: from Latin ēvectiō a going up, from ēvehere to lead forth, from vehere to carry
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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