Pronunciation: (u-sOOm'), [key]
—v.t., -sumed, -sum•ing.
1. to take for granted or without proof; suppose; postulate; posit: to assume that everyone wants peace.
2. to take upon oneself; undertake: to assume an obligation.
3. to take over the duties or responsibilities of: to assume the office of treasurer.
4. to take on (a particular character, quality, mode of life, etc.); adopt: He assumed the style of an aggressive go-getter.
5. to take on; be invested or endowed with: The situation assumed a threatening character.
6. to pretend to have or be; feign: to assume a humble manner.
7. to appropriate or arrogate; seize; usurp: to assume a right to oneself; to assume control.
8. to take upon oneself (the debts or obligations of another).
9. Archaic.to take into relation or association; adopt.
to take something for granted; presume.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.