Webster's English Dictionary

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supposition

sup.po.si.tion \.s*p-*-'zish-*n\ \-'zish-n*l, -*n-*l\ \-e-\ n [ME, fr. LL 
   supposition-, suppositio, fr. L, act of placing beneath], fr. suppositus, 
   pp. of supponere 1: something that is supposed : HYPOTHESIS  2: the act of 
   supposing  - sup.po.si.tion.al aj