1 unexpected, surprising or strange
SynonymincredibleIt's extraordinary that he managed to sleep through the party.What an extraordinary thing to say!The president took the extraordinary step of apologizing publicly for his behaviour!2 not normal or ordinary; greater or better than usualan extraordinary achievementShe was a truly extraordinary woman.They went to extraordinary lengths to explain their behaviour. compare ordinary3 [only before noun] (formal) (of a meeting, etc.) arranged for a special purpose and happening in addition to what normally or regularly happensAn extraordinary meeting was held to discuss the problem.4 (following nouns) (technical) (of an official) employed for a special purpose in addition to the usual staffan envoy extraordinaryextraordinarily
ɪkˈstrɔːdnrəli ; ɪkˌstrɔːrdəˈnerəliadverbHe behaves extraordinarily for someone in his position.extraordinarily difficultShe did extraordinarily well.