Definition of impromptu adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ɪmˈprɒmptjuː//
; NAmE NAmE//ɪmˈprɑːmptuː//
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done without preparation or planning synonym improvise an impromptu speech They often held impromptu meetings in their house. Word Originmid 17th cent. (as an adverb): from French, from Latin in promptu ‘in readiness’, from promptus ‘brought to light’, also ‘prepared, ready’, past participle of promere ‘to produce’, from pro- ‘out, forth’ + emere ‘take’.
See the Oxford Advanced American Dictionary entry: impromptu