Dictionary.com

instantaneous

[ in-stuhn-tey-nee-uhs ]
/ ˌɪn stənˈteɪ ni əs /
Save This Word!
See synonyms for: instantaneous / instantaneously on Thesaurus.com

adjective
occurring, done, or completed in an instant: an instantaneous response.
existing at or pertaining to a particular instant: the instantaneous position of the rocket.
QUIZ
QUIZ YOURSELF ON AFFECT VS. EFFECT!
In effect, this quiz will prove whether or not you have the skills to know the difference between “affect” and “effect.”
Question 1 of 7
The rainy weather could not ________ my elated spirits on my graduation day.
Meet Grammar CoachWrite or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing
Meet Grammar CoachImprove Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help

Origin of instantaneous

From the Medieval Latin word instantāneus, dating back to 1645–55. See instant, -an, -eous

OTHER WORDS FROM instantaneous

in·stan·ta·ne·i·ty [in-stan-tn-ee-i-tee, in-stuhn-tuh-nee-], /ɪnˌstæn tnˈi ɪ ti, ˌɪn stən təˈni-/, in·stan·ta·ne·ous·ness, nounin·stan·ta·ne·ous·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use instantaneous in a sentence

British Dictionary definitions for instantaneous

instantaneous
/ (ˌɪnstənˈteɪnɪəs) /

adjective
occurring with almost no delay; immediate
happening or completed within a momentinstantaneous death
maths
  1. occurring at or associated with a particular instant
  2. equal to the limit of the average value of a given variable as the time interval over which the variable is considered approaches zeroinstantaneous velocity

Derived forms of instantaneous

instantaneously, adverbinstantaneousness or instantaneity (ɪnˌstæntəˈniːɪtɪ), noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
FEEDBACK