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[ih-vek-shuh n] /ɪˈvɛk ʃən/
noun, Astronomy
a periodic irregularity in the moon's motion, caused by the attraction of the sun.
Origin of evection
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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for evection
Historical Examples
  • This he called the evection, and introduced another epicycle to represent it.

    Kepler Walter W. Bryant
  • His chief discovery was an irregularity of the lunar motion, called the ‘evection.’

British Dictionary definitions for evection


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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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