Longman Dictionary of Contemporary English homepage

Language: Old French
Origin: Latin arch-, archi-, from Greek, from archein 'to begin, rule'

arch-

 prefix
     
arch-
XX belonging to the highest class or rank:
an archbishop (=an important bishop)
our archenemy (=our worst enemy)
the company's arch-rivals (=main competitors)
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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