Webster's English Dictionary

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suppose

sup.pose \s*-'po-z, oftenest after "I" 'spo-z\ vb [ME supposen, fr. MF 
   supposer, fr. ML supponere (perf. indic.] supposui), fr. L, to put under, 
   substitute, fr. sub- + ponere to put - more at POSITION 1a: to lay down 
   tentatively as a hypothesis or assumption  1b1: to hold as an opinion : 
   BELIEVE  1b2: to think probable or in keeping with the facts  2a: CONCEIVE, 
   IMAGINE  2b: to have a suspicion of  3: PRESUPPOSE  : CONJECTURE, OPINE