Meaning & use
instantaneous
Occurring or done immediately, without any perceptible delay.
See it in a sentence
His reaction to the loud noise was instantaneous, and he ducked before it even registered.
The new software offers nearly instantaneous search results across millions of documents.
A note on using this word
Instantaneous is more formal and technical than 'instant,' and is common in scientific or precise descriptions of speed.
Words with a similar meaning
immediateinstant
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
Words with an opposite meaning
delayedgradual
Make it your own
Write a sentence using “instantaneous”, then compare your use with the examples above.
Your draft stays on this page and is not sent anywhere.