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English definition of “custom”

custom

noun [C/U] (TRADITION)   /ˈkʌs·təm/
a way of behaving or a belief that has been established for a long time among a group of people: [C] It was a time-honored custom of the club that blue chairs were reserved for senior members only. [C] She’s studying the language and customs of the Hopi Indians.
(Definition of custom noun (TRADITION) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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