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.

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 …

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

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

Dec 14, 2025 · Adjective instantaneous (not comparable) Occurring, arising, or functioning without any delay; happening within an imperceptibly brief period of time. [from 17th c.] Synonyms: …

Something instantaneous is happening right now, without delay. In today's society, the technology we carry in our pockets means people often expect an instantaneous or immediate response …

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

instantaneous, adj. meanings, etymology, pronunciation and more in the Oxford English Dictionary

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