assume - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

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assume

verb [T] uk   /əˈsjuːm/  us   /-ˈsuːm/

assume verb [T] (ACCEPT)

B2 to accept something to be true without question or proof: [+ (that)] I assumed (that) you knew each other because you went to the same school. Let's assume (that) they're coming and make plans on that basis. [+ to infinitive] We can't assume the suspects to be guilty simply because they've decided to remain silent. We mustn't assume the suspects' guilt.
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assume verb [T] (PRETEND TO HAVE)

to pretend to have a different name or be someone you are not, or to express a feeling falsely: Moving to a different town, he assumed a false name. During the investigation, two detectives assumed the identities of antiques dealers. He assumed a look of indifference but I knew how he felt.

assume verb [T] (TAKE CONTROL)

C2 to take or begin to have responsibility or control, sometimes without the right to do so, or to begin to have a characteristic: The new president assumes office at midnight tonight. The terrorists assumed control of the plane and forced it to land in the desert. The issue has assumed considerable political proportions (= has become a big political problem).
(Definition of assume from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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