It means to assume or believe, I guess
But it seems to me that... [DOC] [TLE] meaning - What are the differences between "assumption" and ... [PAR] May 14, 2014 ... Based on the presumption, I can assume that you can not drive, because ... 
expect, believe, think, surmise, guess, judge, conjecture, speculate,... [DOC] [TLE] Suppose Synonyms, Suppose Antonyms | Thesaurus.com [PAR] see definition of suppose.