/ ˌpɑːr ˈeksəlɑːns; NAmE ˌeksəˈlɑːns/ adjective
(from French ) (only used after the noun it describes) better than all the others of the same kind; a very good example of sth :
She turned out to be an organizer par excellence.
► par excellence adverb :
Chemistry was par excellence the laboratory science of the early nineteenth century.
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WORD ORIGIN
French , literally by excellence .