Webster's English Dictionary

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presumption

pre.sump.tion \pri-'z*m(p)-sh*n\ n [ME presumpcioun, fr. OF presumption, 
   fr. LL praesumption-, (Xpraesumptio presumptuous attitude (fr. L) & L 
   praesumption-, praesumptio assumption, fr. praesumptus, pp. of praesumere 
   1: presumptuous attitude or conduct : AUDACITY  2a: an attitude or belief 
   dictated by probability : ASSUMPTION  2b: 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 k nown drawn from the known or proved 
   existence of some other fact