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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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
the quality of being instant
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014