English

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

 

mainline

 adjective
adjective
BrE BrE//ˈmeɪnlaɪn//
 
; NAmE NAmE//ˈmeɪnlaɪn//
 
 
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(especially North American English) belonging to the system, or connected with the ideas that most people accept or believe in synonym mainstream mainline churches/faiths
See the Oxford Advanced American Dictionary entry: mainline

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