Webster's English Dictionary

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assumption

as.sump.tion \*-'s*m(p)-sh*n\ n [ME, fr. LL assumption-, assumptio, fr. L, 
   taking up, fr. assump]tus, pp. of assumere 1a: the taking up of a person 
   into heaven  cap  1b: the church feast commemorating the Assumption of the 
   Virgin Mary that is observed on August 15 2: a taking to or upon oneself  
   3: the act of laying claim to or taking possession of  4: ARROGANCE, 
   PRETENSION  5a: the supposition that something is true  5b: a fact or 
   statement taken for granted  6: the taking over of debts of another