c. 1300, "the reception, uncorrupted, of the Virgin Mary into Heaven," also the Church festival (Aug. 15) commemorating this, Feast of the Assumption, from Old French assumpcion and directly from Latin assumptionem (nominative assumptio) "a taking, receiving," noun of action from past participle stem of assumere "take up, take to oneself" (see assume).
Meaning "minor premise of a syllogism" is late 14c. Meaning "appropriation of a right or possession" is mid-15c. Meaning "action of taking for oneself" is recorded from 1580s; that of "something taken for granted" is from 1620s.
1. We are working on the assumption that it was a gas explosion.
2. Implicit in his speech was the assumption that they were guilty.
3. Traditional economic analysis is premised on the assumption that more is better.
4. The underlying assumption is that the amount of money available is limited.
5. The new governor's assumption of office will take place next Tuesday.