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  Dictionary Definition of sure

adjective, surer, surest, adverb

-- adjective
1. (often followed by of ) free from apprehension or doubt as to the reliability, character, action, etc., of something: to be sure of one's data.
2. confident, as of something expected: sure of ultimate success.
3. convinced, fully persuaded, or positive, as of something firmly believed: sure of a person's guilt.
4. assured or certain beyond question: man is sure of death.
5. worthy of confidence; reliable: a sure messenger.
6. firm or stable: to stand on sure ground.
7. unfailing; never disappointing expectations: a sure cure.
8. unerring; never missing, slipping, etc.: a sure aim.
9. admitting of no doubt or question: sure proof.
10. inevitable: death is sure.
11. destined; bound inevitably; certain: he is sure to come.
12. Archaic. secure or safe.
-- adverb
13. Colloquial surely, undoubtedly, or certainly.
14. US Colloquial inevitably or without fail.
-- phrase
15. a sure thing, Colloquial a certainty; something assured beyond any doubt.
16. be sure, be certain or careful (to do or be as specified): be sure to close the windows.
17. for sure, as a certainty; surely.
18. make sure, a. to be certain (that something is done). b. to be confident in the support or possession ( of ).
19. sure thing, Chiefly US Colloquial assuredly; certainly.
20. to be sure, surely; certainly; without doubt.
[ME, from OF, from L securus secure]
-- sureness, noun