Main Entry: pre·sump·tion

Pronunciation: \pri-ˈzəm(p)-shən\

Function: noun

Etymology: Middle English presumpcioun, from Anglo-French presumption, from Late Latin & Latin; Late Latin praesumption-, praesumptio presumptuous attitude, from Latin, assumption, from praesumere

Date: 13th century

1 : presumptuous attitude or conduct : audacity
2 a : an attitude or belief dictated by probability : assumption b : the ground, reason, or evidence lending probability to a belief
3 : a legal inference as to the existence or truth of a fact not certainly known that is drawn from the known or proved existence of some other fact