in·​stan·​ter in-ˈstan-tər How to pronounce instanter (audio)
: at once

Examples of instanter in a Sentence

as soon as I had called out that answer, I instanter knew that it was wrong

Word History


borrowed from Medieval Latin, "urgently, fervently, immediately," going back to Latin, "vehemently, urgently," by haplology from *instantiter, from instant-, instans "pressing, urgent" + -iter, adverb suffix — more at instant entry 2

First Known Use

1688, in the meaning defined above

Time Traveler
The first known use of instanter was in 1688

Dictionary Entries Near instanter

Cite this Entry

“Instanter.” Dictionary, Merriam-Webster, Accessed 18 Jul. 2024.

Kids Definition


in·​stan·​ter in-ˈstant-ər How to pronounce instanter (audio)
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