Instantaneous

How to spell instantaneous

13 letters · 5 syllables

How to pronounce instantaneous

Say the part in capitals loudest.

What does instantaneous mean?

1. adjectiveHappening or completed in a single moment, with no perceptible delay.

Instantaneous in a sentence

• The app gives instantaneous confirmation as soon as the payment clears.

• His reaction to the cold water was almost instantaneous.

Where does instantaneous come from?

Language of origin: Latin

This word traces back to the Latin verb stare, meaning 'to stand', combined with the prefix in-, giving instare, literally 'to stand upon' or 'to be present and pressing'. From that came the noun instans, the present participle describing the moment 'standing right here', which is also the source of the English word 'instant'. Medieval Latin then coined instantaneus to describe something happening in a single instant, and English borrowed it in the early 1600s, fitting it with the elaborate ending '-aneous' seen in older formations such as 'momentaneous'. The spelling trap lives in that long unstressed tail: the '-taneous' looks as though it might be '-tanious' or '-taneus', and the buried 'e' before '-ous' is easy to drop. Remembering the familiar word 'instant' sitting at the front helps anchor the first half before the tricky ending.

How the word is built

• in- (upon)
• sta (to stand, from stare)
• -ant (present participle)
• -aneous (adjectival ending modelled on words like 'momentaneous')