n. 25B6; noun
this presumption may be easily rebutted : ASSUMPTION, supposition, presupposition, belief, guess, judgement, surmise, conjecture, speculation, hypothesis, postulation, inference, deduction, conclusion.
he apologized for his presumption : BRAZENNESS, audacity, boldness, audaciousness, temerity, arrogance, presumptuousness, forwardness; cockiness, insolence, impudence, bumptiousness, impertinence, effrontery, cheek, cheekiness; rudeness, impoliteness, disrespect, familiarity; informal nerve, brass neck, chutzpah; N. Amer. informal sass, sassiness; archaic assumption.