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

 

ethos

 noun
noun
BrE BrE//ˈiːθɒs//
 
; NAmE NAmE//ˈiːθɑːs//
 
[singular](formal) Moral
 
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the moral ideas and attitudes that belong to a particular group or society an ethos of public service the carefree Californian ethos See related entries: Moral Word Origin mid 19th cent.: from modern Latin, from Greek ēthos ‘nature, disposition’, (plural) ‘customs’.Extra examples Investing in arms companies is strongly against the group’s ethos. The prevailing ethos of the teachers was that of strict discipline. They tried to develop an ethos of public service.
See the Oxford Advanced American Dictionary entry: ethos