Impromptu
来自Big Physics
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mid 17th century (as an adverb): from French, from Latin in promptu ‘in readiness’, from promptus (see prompt).
wiktionary
Borrowed from French impromptu.
etymonline
impromptu (adv.)
1660s, from French impromptu (1650s), from Latin in promptu "in readiness," from assimilated form of in- "into, in, on, upon" (from PIE root *en "in") + promptu, ablative of promptus "ready, prepared; set forth, brought forward," from past participle of promere "to bring out," from pro "before, forward, for" (see pro-) + emere "obtain" (from PIE root *em- "to take, distribute"). From 1764 as an adjective; as a noun from 1680s.
