Plural of ethos; the characteristic spirit, values, or beliefs of a culture, group, or time period.
From Greek ēthos (character, spirit) + plural -es. Ethos has been used since ancient Greek philosophy to describe the essential character of societies.
The 'ethos' of Silicon Valley (move fast and break things) is different from the ethos of traditional academia (verify everything methodically), and these clash when tech companies try to disrupt education.
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