Source : Webster's Revised Unabridged Dictionary (1913)

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.''

         And Esau said, I have enough, my brother. --Gen.
                                                  xxxiii. 9.

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

         How many hired servants of my father's have bread
         enough and to spare!                     --Luke xv. 17.

Enough \E*nough"\, interj.
   An exclamation denoting sufficiency, being a shortened form
   of it is enough.

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

   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.

            I know you well enough; you are Signior Antonio.
                                                  --Shak.

            Thou knowest well enough . . . that this is no time
            to lend money.                        --Shak.

   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.

   Note: Enough usually follows the word it modifies.

Source : WordNet®

enough
     adj : enough to meet a purpose; "an adequate income"; "the food
           was adequate"; "a decent wage"; "enough food"; "food
           enough" [syn: {adequate}, {decent}]
     n : 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: {sufficiency}]
     adv : as much as necessary; "Have I eaten enough?"; (`plenty' is
           nonstandard) "I've had plenty, thanks" [syn: {plenty}]