Real Dictionary

enough
determiner: Enough means as much as you need or as much as is necessary.

enough in American English
as much or as many as necessary, desirable, or tolerable; sufficient
as much or as often as necessary; to the required degree or amount; sufficiently
the amount or number needed, desired, or allowed; sufficiency
adjective: adequate for the want or need; sufficient for the purpose or to satisfy desire
adverb: in a quantity or degree that answers a purpose or satisfies a need or desire; sufficiently
interjection: (used to express impatience or exasperation)
pronoun: an adequate quantity or number; sufficiency

enough in British English
determiner: sufficient to answer a need, demand, supposition, or requirement; adequate