n. 1 the act or an instance of assuming. 2 a the act or an instance of accepting without proof. b a thing assumed in this way. 3 arrogance. 4 (Assumption) a the reception of the Virgin Mary bodily into heaven, according to Roman Catholic doctrine. b the feast in honour of this (15 August).
[ ME f. OF asompsion or L assumptio (as ASSUME, -ION) ]