postulate

hypothesis, proposition, theory, thesis

axiom, truism, verity

belief, canon, doctrine, dogma, gospel, law

precept, principle, rule, standard, tenet

basis, foundation, ground

conclusion, deduction, inference

affirmation, assertion, avouchment, declaration

dictum, ipse dixit

accept, believe, credit, swallow

conclude, deduce, gather, infer, judge, take

conjecture, figure, guess, reckon [chiefly dialect], surmise, suspect, suspicion [chiefly dialect], think

conceive, dream, fancy, imagine, perceive, preconceive

speculate, theorize

affirm, allege, assert, aver, avouch, avow, claim, contend, declare, insist, maintain, profess