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1. A period of time so short as to be almost imperceptible. 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.
1. Occurring at once; immediate: instant gratification.
2. Imperative; urgent: an instant need.
3. Now under consideration; present.
a. Commercially prepared or processed for quick and easy final preparation: an instant cake mix.
b. Appearing, done, or taking place with great quickness and ease: "She had the gift of instant intimacy" (Sylvia Jukes Morris).
c. Quickly and easily resolved or determined: instant lottery tickets.
At once; instantly.

[Middle English, from Old French, from Latin īnstāns, īnstant-, present, present participle of īnstāre, to approach : in-, on; see in-2 + stāre, to stand; see stā- in Indo-European roots.]

in′stant·ness n.


the quality of being instant
References in periodicals archive ?
Cameron replied he was not, adding: "I think that politicians do have to think about what we say and that the trouble with Twitter--the instantness of it" (1) might result in too many tweets making a twit--to paraphrase the continuation of Cameron's own infamous quote.
Prime Minister David Cameron infamously told radio listeners in 2009: "The trouble with Twitter, the instantness of it - too many twits might make a tw*t.
Whereas the metanarratives embodied the unity of a complex tissue of historical actions, the new postmodern style of self-storytelling celebrates disconnection, instantness and nonsense.