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WordNet-OnlineFree dictionary and thesaurus of English. Definitions, synonyms, antonyms and more...
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Adjective instant has 3 senses
instantaneous, instant - occurring with no delay; "relief was instantaneous"; "instant gratification"Antonym:  slow (indirect, via fast)
 
instant, inst - in or of the present month; "your letter of the 10th inst"Antonym:  future (indirect, via past, present)
 Antonym:  past (indirect, via present, future)
 
clamant, crying, exigent, insistent, instant - demanding attention; "clamant needs"; "a crying need"; "regarded literary questions as exigent and momentous"- H.L.Mencken; "insistent hunger"; "an instant need"Antonym:  beseeching (indirect, via imperative)
 
 
Noun instant has 2 senses
blink of an eye, flash, heartbeat, instant, jiffy, split second, trice, twinkling, wink, New York minute - a very short time (as the time it takes the eye blink or the heart to beat); "if I had the chance I'd do it in a flash"--1 is a kind of moment, minute, second, bit
 
moment, minute, second, instant - a particular point in time; "the moment he arrived the party began"--2 is a kind of point, point in time
 --2 has particulars:
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