An adequate quantity; a quantity that is large enough to achieve a purpose:
— Enough is as good as a feast.

synonym: sufficiency.

Roget 639: sufficiency, adequacy, enough, withal, satisfaction, competence; no less; quantum sufficit [Lat.], Q.   S. mediocrity etc. (average) 29.    fill; fullness etc. (completeness) 52; plenitude, plenty; abundance; copiousness etc. adj.; amplitude, galore, lots, profusion; full measure; good measure pressed down and running, over." luxuriance etc. (fertility) 168; affluence etc. (wealth) 803; fat of the land; a land flowing with milk and honey;" cornucopia; horn of plenty, horn of Amalthaea; mine etc. (stock) 636.    outpouring; flood etc. (great quantity) 31; tide etc. (river) 348; repletion etc. (redundancy) 641; satiety etc. 869.    ... show more

Sufficient for the purpose:
— Enough food.
— Food enough.

synonym: adequate.

Roget 639: sufficient, enough, adequate, up to the mark, commensurate, competent, satisfactory, valid, tangible.    measured; moderate etc. (temperate) 953.    full, etc. (complete) 52; ample; plenty, plentiful, plenteous; plenty as blackberries; copious, abundant; abounding etc. v.; replete, enough and to spare, flush; choke-full, chock-full; well-stocked, well-provided; liberal; unstinted, unstinting; stintless^†; without stint; unsparing, unmeasured; lavish etc. 641; wholesale.    rich; luxuriant etc. (fertile) 168; affluent etc. (wealthy) 803; wantless^†; big with etc. (pregnant) 161.    unexhausted^†, unwasted^†; exhaustless, inexhaustible.    ... show more

As much as necessary:
— Have I eaten enough?.

synonym: plenty.

Roget 31: truly etc. (truth) 494 [in a positive degree]; decidedly, unequivocally, purely, absolutely, seriously, essentially, fundamentally, radically, downright, in all conscience; for the most part, in the main.    [in a complete degree] entirely etc. (completely) 52; abundantly etc. (sufficiently) 639; widely, far and wide.    [in a great or high degree] greatly etc. adj.; much, muckle^†, well, indeed, very, very much, a deal, no end of, most, not a little; pretty, pretty well; enough, in a great measure, richly; to a large extent, to a great extent, to a gigantic extent; on a large scale; so; never so, ever so; ever so dole; scrap, shred, tag, splinter, rag, much; by wholesale; mighty, powerfully; with a witness, ultra [Lat.], in the extreme, extremely, exceedingly, intensely, exquisitely, acutely, indefinitely, immeasurably; beyond compare, beyond comparison, beyond measure, beyond all bounds; incalculably, infinitely.    [in a supreme degree] preeminently, superlatively etc. (superiority) 33.    [in a too great degree] immoderately, monstrously, preposterously, inordinately, exorbitantly, excessively, enormously, out of all proportion, with a vengeance.    [in a marked degree] particularly, remarkably, singularly, curiously, uncommonly, unusually, peculiarly, notably, signally, strikingly, pointedly, mainly, chiefly; famously, egregiously, prominently, glaringly, emphatically, kat exochin [Gr.], strangely, wonderfully, amazingly, surprisingly, astonishingly, incredibly, marvelously, awfully, stupendously.    [in an exceptional degree] peculiarly etc. (unconformity) 83.    [in a violent degree] furiously etc. (violence) 173; severely, desperately, tremendously, extravagantly, confoundedly, deucedly, devilishly, with a vengeance; a outrance^†, a toute outrance [Fr.].    [in a painful degree] painfully, sadly, grossly, sorely, bitterly, piteously, grievously, miserably, cruelly, woefully, lamentably, shockingly, frightfully, dreadfully, fearfully, terribly, horribly.    ... show more

Roget 651: almost &c.; to a limited extent, rather etc. 32; pretty, moderately, passing; only, considering, all things considered, enough.