transitive verb supposed -·posed′, supposing -·pos′·ing

1. to assume to be true, as for the sake of argument or to illustrate a proof suppose A equals B
2. to believe, think, guess, etc. I suppose you're right
3. presuppose (sense )
4. to consider as a proposed or suggested possibility: used in the imperative suppose they don't come
5. to expect or obligate: always in the passive you're supposed to telephone

Etymology: ME supposen < MFr supposer, to suppose, imagine, altered (infl. by poser: see pose) < ML supponere, to suppose, assume < L, to put under, substitute < sub-, sub- + ponere: see position

intransitive verb