[adv] definitely or positively; "the results are surely encouraging"; "she certainly is a hard worker"; "it's going to be a good day for sure"; "they are coming, for certain"; "they thought he had been killed sure enough"; "he'll win sure as shooting"; (`sure' is used informally for `surely' as in"they sure smell good"; "sure he'll come")
[adj] not open to doubt; "she wanted to go; that was for sure"