–verb (used with object)
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.
Biggest pet peeve? People who make assumptions. See definition number one.
Just stop making assumptions.