to take (a supposition or hypothesis) as granted or true; to suppose (something) for the sake of argument
to take (a role etc) upon oneself; to undertake (a task or duty)
to invest oneself formally with (an office or its symbols)
They assumed the trappings of power
to feign (a certain attitude)
She assumed an air of calm
to adopt (a new name, identity, etc)
to acquire or grow to have (e.g. significance)
to seize or usurp (power or authority)
assumable adj
assumably adv
[Middle English assumen from Latin assumere, from as- + sumere to take]