Definition of mores noun from the Oxford Advanced Learner's Dictionary

 

mores

 noun
noun
BrE BrE//ˈmɔːreɪz//
 
; NAmE NAmE//ˈmɔːreɪz//
 
[plural](formal)
 
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the customs and behaviour that are considered typical of a particular social group or community synonym conventions changes in social mores The judgement says a lot about contemporary British social mores. They were blamed for a steady decline in sexual mores. Word Origin late 19th cent.: from Latin, plural of mos, mor- ‘custom’.
See the Oxford Advanced American Dictionary entry: mores