— evectional , adj.
/i vek"sheuhn/ , n. Astron.
a periodic irregularity in the moon's motion, caused by the attraction of the sun.
[ 1650-60; evection- (s. of evectio ) a going upwards, flight, equiv. to evect ( us ) (ptp. of evehere to carry forth, move forth) + -ion- -ION ]