5 days ago · The meaning of INSTANTANEOUS is done, occurring, or acting without any perceptible duration of time. How to use instantaneous in a sentence.

INSTANTANEOUS definition: 1. happening immediately, without any delay: 2. happening immediately, without any delay: 3…. Learn more.

INSTANTANEOUS definition: occurring, done, or completed in an instant. See examples of instantaneous used in a sentence.

Feb 21, 2026 · Adjective instantaneous (not comparable) Occurring, arising, or functioning without any delay; happening within an imperceptibly brief period of time. [from 17th c.] Synonyms: immediate, …

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 …

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 …

Definition of instantaneous adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Something that is instantaneous happens immediately and very quickly. Death was instantaneous because both bullets hit the heart.

5 days ago · Synonyms for INSTANTANEOUS: immediate, instant, rapid, split-second, swift, summary, straightaway, quick; Antonyms of INSTANTANEOUS: slow, prolonged, sluggish, protracted, tardy, …

It can be almost instantaneous, preparing us to respond to threats faster than our conscious minds can even assess a situation.