Definition of instant

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instantaneous >

in·stant    (nstnt) KEY 

NOUN:

1. An almost imperceptible space of time. See Synonyms at moment.
2. A particular or precise time: at the instant of combustion.
3. Abbr. inst. The current month: your letter of the 15th instant.
4. A food or beverage designed for quick preparation.

ADJECTIVE:

1. Occurring at once; immediate: instant gratification.
2. Imperative; urgent: an instant need.
3. Now under consideration; present.
4. 1. Commercially prepared or processed for quick and easy final preparation: an instant cake mix.
   2. Readily soluble in water: instant coffee; instant powdered milk.
   3. Appearing, done, or taking place with or as if with maximum quickness and ease: "She had the gift of instant intimacy" (Sylvia Jukes Morris).

ADVERB:

At once; instantly.

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ETYMOLOGY:
Middle English, from Old French, from Latin nstns, nstant-, present, present participle of nstre, to approach : in-, on ; see in-² + stre, to stand; see st- in Indo-European roots

OTHER FORMS:
instant·ness(Noun)