WordReference Random House Unabridged Dictionary of American English © 2026
e•vec•tion
(i vek′shən),USA pronunciation n. [Astron.]
e•vec′tion•al, adj.
- Astronomya periodic irregularity in the moon's motion, caused by the attraction of the sun.
- Latin ēvectiōn- (stem of ēvectiō) a going upwards, flight, equivalent. to ēvect(us) (past participle of ēvehere to carry forth, move forth) + -iōn- -ion
- 1650–60