[ 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


e·vec·tion·al, adjective

Words nearby evection

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for evection

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

  • This he called the evection, and introduced another epicycle to represent it.

    Kepler|Walter W. Bryant

British Dictionary definitions for evection

/ (ɪˈvɛkʃən) /


irregularity in the moon's motion caused by perturbations of the sun and planets

Derived forms of evection

evectional, adjective

Word Origin for evection

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