Definition of par excellence adjective from the Oxford Advanced American Dictionary

 

par excellence

 adjective
adjective
NAmE//ˌpɑr ˌɛksəˈlɑns//
 
(from French)
 
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(only used after the noun it describes) better than all the others of the same kind; a very good example of something She turned out to be an organizer par excellence.
par excellenceadverb
 
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Chemistry was par excellence the laboratory science of the early nineteenth century.