Definition of custom adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈkʌstəm//
; NAmE NAmE//ˈkʌstəm//
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[only before noun] (especially North American English) = custom-built, custom-made a custom motorcycle Word OriginMiddle English: from Old French coustume, based on Latin consuetudo, from consuetus, past participle of consuescere ‘accustom’, from con- (expressing intensive force) + suescere ‘become accustomed’.
See the Oxford Advanced American Dictionary entry: custom