Main Entry: ex·tem·po·ra·ne·ous

Pronunciation: \(ˌ)ek-ˌstem-pə-ˈrā-nē-əs\

Function: adjective

Etymology: Late Latin extemporaneus, from Latin ex tempore

Date: 1673

1 a (1) : composed, performed, or uttered on the spur of the moment : impromptu <an extemporaneous comment> (2) : carefully prepared but delivered without notes or text b : skilled at or given to extemporaneous utterance c : happening suddenly and often unexpectedly and usually without clearly known causes or relationships <a great deal of criminal and delinquent behavior is…extemporaneous — W. C. Reckless>
2 : provided, made, or put to use as an expedient : makeshift <an extemporaneous shelter>

— ex·tem·po·ra·ne·ous·ly adverb

— ex·tem·po·ra·ne·ous·ness noun