enough

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Sufficient to meet a need or satisfy a desire; adequate: synonym: sufficient.
• pronoun An adequate number or quantity.
• adverb To a satisfactory amount or degree; sufficiently.
• adverb Very; fully; quite.
• adverb Tolerably; rather.
• interjection Used to express impatience or exasperation.

from The Century Dictionary.

• An elliptical exclamation, signifying ‘it (or that) is enough,’ ‘I have had enough,’ ‘you have done enough,’ etc.
• Answering the purpose; adequate to want or demand; sufficient; satisfying desire; giving content; meeting reasonable expectation.
• Synonyms Sufficient, Competent, etc. See adequate.
• noun A quantity of a thing or act, or a number of things or persons, sufficient to satisfy desire or want, or adequate to a purpose; sufficiency: as, we have enough of this sort of cloth.
• noun Synonyms Plenty, abundance.
• In a quantity or degree that answers the purpose, satisfies, or is equal to the desires or wants; to a sufficient degree; sufficiently.
• To a notable extent; fairly; rather: used to denote a slight augmentation of the positive degree, the force depending upon the connection or the emphasis: as, he is ready enough to embrace the offer.
• In a tolerable or passable degree: used to denote diminution, or a degree or quality rather less than is desired, or such a quantity or degree as commands acquiescence rather than full satisfaction: as, the performance is well enough.
• To a great degree; very much.

from the GNU version of the Collaborative International Dictionary of English.

• interjection An exclamation denoting sufficiency, being a shortened form of it is enough.
• adjective Satisfying desire; giving content; adequate to meet the want; sufficient; -- usually, and more elegantly, following the noun to which it belongs.
• adverb In a degree or quantity that satisfies; to satisfaction; sufficiently.
• adverb Fully; quite; -- used to express slight augmentation of the positive degree, and sometimes equivalent to very.
• adverb In a tolerable degree; -- used to express mere acceptableness or acquiescence, and implying a degree or quantity rather less than is desired.
• noun A sufficiency; a quantity which satisfies desire, is adequate to the want, or is equal to the power or ability.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• determiner sufficient; all that is required, needed, or appropriate
• adverb sufficiently
• pronoun A sufficient or adequate number, amount, etc.
• interjection stop! Don't do that anymore, etc.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adverb as much as necessary
• adjective sufficient for the purpose
• noun an adequate quantity; a quantity that is large enough to achieve a purpose