/di sen"sheuhn/ , n.
1. Astrol. the part of the zodiac in which the influence of a planet is weakest. Cf. exaltation (def. 6).
2. descent.
[ 1350-1400; ME descensioun descension descension- (s. of descensio ), equiv. to descens ( us ) (ptp. of descendere to DESCEND) + -ion- -ION ]