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English definition of “mainline”

mainline

adjective (COMMON)    /ˈmeɪn.laɪn/ usually US
involving beliefs, methods, etc. that are most common: mainline churches the rivalry between catalog companies and mainline storesHabitual and customaryStandard and routine
(Definition of mainline adjective (COMMON) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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