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

 

impromptu

 adjective
adjective
BrE BrE//ɪmˈprɒmptjuː//
 
; NAmE NAmE//ɪmˈprɑːmptuː//
 
 
jump to other results
done without preparation or planning synonym improvise an impromptu speech They often held impromptu meetings in their house. Word Origin mid 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