Definition of the moral majority noun from the Oxford Advanced Learner's Dictionary

 

the moral majority

 noun
noun
BrE
 
; NAmE
 
[singular + singular or plural verb]
 
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the largest group of people in a society, considered as having very traditional ideas about moral matters, religion, sexual behaviour, etc. Word Origin 1970s: originally as Moral Majority, the name of a right-wing movement in the US.
See the Oxford Advanced American Dictionary entry: the moral majority