instant

The definition of instant is something that is urgent or happens immediately.

(adjective)

An example of instant is an answer received very quickly, an instant response.
An example of instant is oatmeal that has been pre-cooked and dried for very quick cooking, instant oatmeal.

See instant in Webster's New World College Dictionary

adjective

urgent; pressing
soon to happen; imminent
without delay; immediate: to demand instant obedience
designating a food or beverage in readily soluble, concentrated, or precooked form, that can be prepared quickly, as by adding water
Archaic present; current

Origin: LME < MFr < L instans, prp. of instare, to stand upon or near, press < in-, in, upon + stare, to stand

adverb

Old Poet. at once; instantly
Old-fashioned (in the) present (month): yours of the 13th (day) instant received

noun

See instant in American Heritage Dictionary 4

noun

adjective

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