The Collaborative International Dictionary of English v.0.48:

Sufficient \Suf*fi"cient\, a. [L. sufficiens, -entis, p. pr. of
   sufficere: cf. F. suffisant. See Suffice.]
   1. Equal to the end proposed; adequate to wants; enough;
      ample; competent; as, provision sufficient for the family;
      an army sufficient to defend the country.
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            My grace is sufficient for thee.      --2 Cor. xii.
                                                  9.
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   2. Possessing adequate talents or accomplishments; of
      competent power or ability; qualified; fit.
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            Who is sufficient for these things?   --2 Cor. ii.
                                                  16.
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   3. Capable of meeting obligations; responsible.
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            The man is, notwithstanding, sufficient . . . I
            think I may take his bond.            --Shak.
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   4. Self-sufficient; self-satisfied; content. [R.]
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            Thou art the most sufficient (I'll say for thee),
            Not to believe a thing.               --Beau. & Fl.
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   Syn: Enough; adequate; competent; full; satisfactory; ample.
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WordNet (r) 3.0 (2006):

sufficient
    adj 1: of a quantity that can fulfill a need or requirement but
           without being abundant; "sufficient food" [ant:
           deficient, insufficient]