The Collaborative International Dictionary of English v.0.48:

Enough \E*nough"\, n.
   A sufficiency; a quantity which satisfies desire, is adequate
   to the want, or is equal to the power or ability; as, he had
   enough to do take care of himself. "Enough is as good as a
   feast."
   [1913 Webster]

         And Esau said, I have enough, my brother. --Gen.
                                                  xxxiii. 9.
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The Collaborative International Dictionary of English v.0.48:

Enough \E*nough"\ ([-e]*n[u^]f"), a. [OE. inoh, inow, enogh, AS.
   gen[=o]h, gen[=o]g, a. & adv. (akin to OS. gin[=o]g, D.
   genoeg, OHG. ginoug, G. genug, Icel. gn[=o]gr, Sw. nog, Dan.
   nok, Goth. gan[=o]hs), fr. geneah it suffices (akin to Goth.
   ganah); pref. ge- + a root akin to L. nancisci to get, Skr.
   na[,c], Gr. 'enegkei^n to carry.]
   Satisfying desire; giving content; adequate to meet the want;
   sufficient; -- usually, and more elegantly, following the
   noun to which it belongs.
   [1913 Webster]

         How many hired servants of my father's have bread
         enough and to spare!                     --Luke xv. 17.
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The Collaborative International Dictionary of English v.0.48:

Enough \E*nough"\, adv.
   1. In a degree or quantity that satisfies; to satisfaction;
      sufficiently.
      [1913 Webster]

   2. Fully; quite; -- used to express slight augmentation of
      the positive degree, and sometimes equivalent to very; as,
      he is ready enough to embrace the offer.
      [1913 Webster]

            I know you well enough; you are Signior Antonio.
                                                  --Shak.
      [1913 Webster]

            Thou knowest well enough . . . that this is no time
            to lend money.                        --Shak.
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   3. In a tolerable degree; -- used to express mere
      acceptableness or acquiescence, and implying a degree or
      quantity rather less than is desired; as, the song was
      well enough.
      [1913 Webster]

   Note: Enough usually follows the word it modifies.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

enough \e*nough"\, interj.
   An exclamation denoting sufficiency, being a shortened form
   of it is enough.
   [1913 Webster]

WordNet (r) 3.0 (2006):

enough
    adv 1: as much as necessary; "Have I eaten enough?"; (`plenty'
           is nonstandard) "I've had plenty, thanks" [syn: enough,
           plenty]
    adj 1: sufficient for the purpose; "an adequate income"; "the
           food was adequate"; "a decent wage"; "enough food"; "food
           enough" [syn: adequate, decent, enough]
    n 1: an adequate quantity; a quantity that is large enough to
         achieve a purpose; "enough is as good as a feast"; "there
         is more than a sufficiency of lawyers in this country"
         [syn: enough, sufficiency]

Moby Thesaurus II by Grady Ward, 1.0:

72 Moby Thesaurus words for "enough":
   abundance, abundantly, acceptably, adequacy, adequate,
   adequate supply, adequately, adequateness, admissibly, agreeably,
   ample, ampleness, amply, bare minimum, bare sufficiency,
   barely sufficient, comfortable, commensurate, commensurately,
   competence, competency, competent, competently, corresponding,
   decent, decently, due, enrage, equal to, exact measure, fairly,
   fit, good, good enough, incense, infuriate, ire, just enough, mad,
   madden, minimal, minimally, minimum, moderately, passably, plenty,
   plenty good enough, proportionate, proportionately, rather,
   reasonably, right amount, satisfaction, satisfactorily,
   satisfactoriness, satisfactory, satisfactory amount, satisfyingly,
   so-so, steam up, substantial, substantially, sufficiency,
   sufficient, sufficient for, sufficiently, sufficientness,
   sufficing, suitable, tolerably, umbrage, up to



The Devil's Dictionary (1881-1906):

ENOUGH, pro.  All there is in the world if you like it.

    Enough is as good as a feast -- for that matter
    Enougher's as good as a feast for the platter.
                                                      Arbely C. Strunk