1. (noun) 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 to blink or the heart to beat)
Synonyms: nictitation, second, instant, blinking, flashbulb, pulse, flashgun, eye blink, beat, heartbeat, minute, news bulletin, moment, flash, photoflash, split second, flare, pulsation, winking, flash bulb, wink, nictation, newsbreak, flashing, newsflash, jiffy, ostentation, flash lamp, blink of an eye, blink, fanfare, trice, twinkling
Antonyms: beseeching, past, imploring, pleading, future, slow
2. (adj) moment, minute, second, instant
a particular point in time
Synonyms: endorsement, consequence, instant, present moment, import, second, minute of arc, arcminute, second gear, s, flash, sec, secondment, min, hour, moment, indorsement, wink, twinkling, here and now, heartbeat, jiffy, mo, second base, irregular, blink of an eye, split second, trice, bit, arcsecond, minute
Antonyms: imploring, beseeching, pleading, past, future, slow
3. (adj) instantaneous, instant(a)
occurring with no delay
Antonyms: pleading, imploring, slow, beseeching, past, future
4. (adj) instant, inst
in or of the present month
Synonyms: exigent, instant, clamant, inst, instantaneous, insistent, crying, instant(a)
Antonyms: past, imploring, pleading, future, slow, beseeching
5. (adj) clamant, crying, exigent, insistent, instant
demanding attention
Synonyms: instant, clamant, insistent, instant(a), egregious, exigent, glaring, gross, flagrant, strident, repetitive, vociferous, crying(a), blatant, clamorous, instantaneous, exacting, rank, crying, inst
Antonyms: pleading, future, beseeching, slow, imploring, past
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Synonyms and Antonyms of instant 
