presumption Definition

1. Something presumed.

Example: The presumption was that her first husband was dead
Thesaurus: presupposition, supposition, conjecture, belief, surmise, guess, hypothesis, opinion.
2. Grounds or justification for presuming something.
3. Inappropriate boldness in one's behaviour towards others; insolence or arrogance.

Thesaurus: arrogance, audacity, gall, nerve, boldness, effrontery, presumptuousness, forwardness, insolence, cheek, chutzpah (US slang), impudence, temerity; Antonym: humility, politeness.
4. The act of presuming.