impromptu
Syllabification: (im·promp·tu)
Pronunciation: /imˈpräm(p)ˌt(y)o͞o/
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Definition of impromptu
adjective & adverb
noun ( plural impromptus)
Origin:
mid 17th century (as an adverb): from French, from Latin in promptu 'in readiness', from promptus (see prompt)