The Collaborative International Dictionary of English v.0.48:

Sure \Sure\, a. [Compar. Surer; superl. Surest.] [OE. sur,
   OF. se["u]r, F. s[^u]r, L. securus; se aside, without + cura
   care. See Secure, and cf. Assure, Insure, Sicker
   sure.]
   1. Certainly knowing and believing; confident beyond doubt;
      implicity trusting; unquestioning; positive.
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            We are sure that the judgment of God is according to
            truth against them which commit such things. --Rom.
                                                  ii. 2.
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            I'm sure care 's an enemy of life.    --Shak.
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   2. Certain to find or retain; as, to be sure of game; to be
      sure of success; to be sure of life or health.
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   3. Fit or worthy to be depended on; certain not to fail or
      disappoint expectation; unfailing; strong; permanent;
      enduring. "His sure word." --Keble.
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            The Lord will certainly make my lord a sure house;
            because my lord fighteth the battles of the Lord.
                                                  --1 Sam. xxv.
                                                  28.
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            The testimony of the Lord is sure.    --Ps. xix. 7.
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            Which put in good sure leather sacks. --Chapman.
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   4. Betrothed; engaged to marry. [Obs.]
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            The king was sure to Dame Elizabeth Lucy, and her
            husband before God.                   --Sir T. More.
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            I presume . . . that you had been sure as fast as
            faith could bind you, man and wife.   --Brome.
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   5. Free from danger; safe; secure.
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            Fear not; the forest is not three leagues off;
            If we recover that we are sure enough. --Shak.
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   To be sure, or Be sure, certainly; without doubt; as,
      Shall you do? To be sure I shall.

   To make sure.
      (a) To make certain; to secure so that there can be no
          failure of the purpose or object. "Make Cato sure."
          --Addison. "A peace can not fail, provided we make
          sure of Spain." --Sir W. Temple.
      (b) To betroth. [Obs.]
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                She that's made sure to him she loves not well.
                                                  --Cotgrave.
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   Syn: Certain; unfailing; infallible; safe; firm; permanent;
        steady; stable; strong; secure; indisputable; confident;
        positive.
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The Collaborative International Dictionary of English v.0.48:

Sure \Sure\, adv.
   In a sure manner; safely; certainly. "Great, sure, shall be
   thy meed." --Spenser.
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         'T is pleasant, sure, to see one's name in print.
                                                  --Byron.
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WordNet (r) 3.0 (2006):

sure
    adv 1: definitely or positively (`sure' is sometimes used
           informally for `surely'); "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"; "they sure smell good";
           "sure he'll come" [syn: surely, certainly, sure,
           for sure, for certain, sure enough, sure as
           shooting]
    adj 1: having or feeling no doubt or uncertainty; confident and
           assured; "felt certain of success"; "was sure (or
           certain) she had seen it"; "was very sure in his
           beliefs"; "sure of her friends" [syn: certain(p),
           sure] [ant: incertain, uncertain, unsure]
    2: exercising or taking care great enough to bring assurance;
       "be certain to disconnect the iron when you are through"; "be
       sure to lock the doors" [syn: certain, sure]
    3: certain to occur; destined or inevitable; "he was certain to
       fail"; "his fate is certain"; "In this life nothing is
       certain but death and taxes"- Benjamin Franklin; "he faced
       certain death"; "sudden but sure regret"; "he is sure to win"
       [syn: certain, sure] [ant: uncertain]
    4: physically secure or dependable; "a sure footing"; "was on
       sure ground"
    5: reliable in operation or effect; "a quick and certain
       remedy"; "a sure way to distinguish the two"; "wood dust is a
       sure sign of termites" [syn: certain, sure]
    6: (of persons) worthy of trust or confidence; "a sure (or
       trusted) friend" [syn: sure, trusted]
    7: infallible or unfailing; "a sure (or true) sign of one's
       commitment"
    8: certain not to fail; "a sure hand on the throttle"
    9: impossible to doubt or dispute; "indisputable (or sure)
       proof" [syn: indisputable, sure]

The Free On-line Dictionary of Computing (19 January 2023):

Sure

   ["Towards a Broader Basis for Logic Programming", Bharat
   Jayaraman, TR CS Dept, SUNY Buffalo, 1990].

   (1995-01-05)