instant

adj. immediate, instantaneous, quick; urgent, pressing; quickly prepared, needing little work or effort to be ready; present, current

n. moment, very short space of time; present moment; food or beverage which can be prepared in a very short amount of time; current month

The present is the time that is perceived directly, not as a recollection or a speculation. It is often considered as a point in space-time, often called now, but it may also be viewed as a duration (see specious present).When comparing time in places separated by great distances, the notion of present becomes unclear. For example, we visually perceive stars to be where they were when the light now reaching our eyes was emitted, because even though light travels at approximately 3 x 10⁸ m/s it takes many years to reach us.
See more at Wikipedia.org...

Noun
1. 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"
(synonym) blink of an eye, flash, heartbeat, jiffy, split second, trice, twinkling, wink, New York minute
(hypernym) moment, minute, second, bit
2. a particular point in time; "the moment he arrived the party began"
(synonym) moment, minute, second
(hypernym) point, point in time
(hyponym) climax, culmination
Adjective
1. occurring with no delay; "relief was instantaneous"; "instant gratification"
(synonym) instantaneous, instant(a)
(similar) fast
2. in or of the present month; "your letter of the 10th inst"
(synonym) inst
(similar) present(a)
3. demanding attention; "clamant needs"; "a crying need"; "regarded literary questions as exigent and momentous"- H.L.Mencken; "insistent hunger"; "an instant need"
(synonym) clamant, crying, exigent, insistent
(similar) imperative

instant, immediate, quickly prepared

adj. pressing, urgent

n. moment, instant; second, minute; while