Definition of instantaneous adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
1. Occurring or completed without perceptible delay: Relief was instantaneous. 2. Done or made as quickly or directly as possible: an instantaneous reply to my letter. 3. Present or occurring at a specific instant: instantaneous velocity; instantaneous pressure.
instantaneous (not comparable) Occurring, arising, or functioning without any delay; happening within an imperceptibly brief period of time. [from 17th c.] synonyms quotations Synonyms: immediate, instant; see also Thesaurus: instantaneous
The adjective instantaneous means “happening very quickly, in a single moment.” This is very similar to the meaning of instant. However, most English speakers would say that something that is instantaneous happens even more quickly than something that is instant.
occurring, done, or completed in an instant: an instantaneous response. existing at or pertaining to a particular instant: the instantaneous position of the rocket.
