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Definition of assumption : 1. A festival in honor of the ascent of the Virgin Mary into heaven.
2. The act of assuming, or taking to or upon one's self; the act of taking up or adopting.
3. The act of taking for granted, or supposing a thing without proof; supposition; unwarrantable claim.
4. The minor or second proposition in a categorical syllogism.
5. The taking of a person up into heaven.
6. The thing supposed; a postulate, or proposition assumed; a supposition.

Synonyms:

surmise, greatness, nerve, cheek, consequence, control, pomposity, chutzpah, domination, bumptiousness, precondition, disrespect, lordliness, forwardness, high horse, peremptoriness, nerviness, authority, supposal, arrogance, philosophy, self-importance, speculation, surmisal, guess, discourtesy, power, overconfidence, impertinence, thought, effrontery, brass, cheekiness, boldness, force, huffiness, leadership, given, toploftiness, arrogation, Assumption of Mary, impudence, pretense, self-consequence, sauce, familiarity, pretentiousness, theory, uppityness, commitment, courtesy, faith, attitude, laying claim, brashness, loftiness, impudency, rudeness, pretension, pompousness, usurpation, masterfulness, assuming, preemption, proof, give, oligopoly, gall, postulate, hypothetical, might, face, confidence, self-confidence, self-assertion, imperiousness, superciliousness, August 15, pushiness, haughtiness, monopoly, reason, audaciousness, supposition, self-reliance, sassiness, assurance, presumptuousness, pertness, incivility, audacity, brazenness, premiss, superiority, crust, sauciness, seizure, hauteur, ideal, if, insolence, uppishness, trust

annexation, acquisition, procurement, catch, gain, claim, addition, collection, appropriation, accumulation, purchase

hypothesis, opinion, matter, postulation, essay, concept, point, consideration, conjecture, subject, idea, exposition, basis, premise, text, theme, inference, position, argument, issue, assertion, problem, principle, query, question, motif, statement, contention, thesis, theorem, belief, dissertation, paradigm, topic, axiom

envisagement, apprehension, readiness, foreknowledge, presupposition, preparedness, deduction, presumption, expectance, anticipation, suspicion

Usage examples:

• For Mr. Wade belonged to that class of Englishmen which has a horror of all sentiment, and takes care to cloak its good actions by the assumption of an unworthy motive. - "Roden's Corner", Henry Seton Merriman.
• I exclaimed with, I am sure, an excellent assumption of surprise. - "The Red Symbol", John Ironside.
• It was necessary to keep constantly at the jefe, and it soon became plain that he was making no great effort to secure subjects for us, on the assumption that we had better wait until Sunday, when there would be plenty of people without trouble to the police. - "In Indian Mexico (1908)", Frederick Starr.