a periodic irregularity in the moon's motion, caused by the attraction of the sun.
- e·vec·tion·al, adjective
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British Dictionary definitions for evection
irregularity in the moon's motion caused by perturbations of the sun and planets
- evectional, adjective
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