v.tr. 1 (usu. foll. by that + clause) take or accept as being true, without proof, for the purpose of argument or action. 2 simulate or pretend (ignorance etc.). 3 undertake (an office or duty). 4 take or put on oneself or itself (an aspect, attribute, etc.) (the problem assumed immense proportions). 5 (usu. foll. by to) arrogate, usurp, or seize (credit, power, etc.) (assumed to himself the right of veto). assumable adj. assumedly adv.
[ ME f. L assumere (as AD-, sumere sumpt- take) ]