Definition of arch- combining form from the Oxford Advanced Learner's Dictionary

 

arch-

 combining form
combining form
BrE BrE//ɑːtʃ//
 
; NAmE NAmE//ɑːrtʃ//
 
 
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(in nouns) main; most important or most extreme archbishop arch-enemy Word Originvia Latin from Greek arkhi-, from arkhos ‘chief’.
See the Oxford Advanced American Dictionary entry: arch-