Relating to the customs, laws, or practices that characterize a particular people or culture.
From Greek ēthos (custom, character) + -nomic (relating to laws or management). This is a rare variant emphasizing the 'law-like' aspects of cultural practices.
Every culture has ethonomic patterns—unstated 'rules' about eye contact, personal space, and greetings—that foreigners violate accidentally, showing culture is grammar-like structure.
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