[ex.tem.po.ra.ne.ous] adj [LL extemporaneus, fr. L ex tempore] (1673) 1 a (1): composed, performed, or uttered on the spur of the moment: impromptu (2): carefully prepared but delivered without notes or text b: skilled at or given to extemporaneous utterance c: happening suddenly and often unexpectedly and usu. without clearly known causes or relationships "a great deal of criminal and delinquent behavior is ... ~ --W. C. Reckless"
2: provided, made, or put to use as an expedient: makeshift -- ex.tem.po.ra.ne.ous.ly adv -- ex.tem.po.ra.ne.ous.ness n