A custom was a long-standing way of life or belief of a species. Beginning as a new practice or usage, a custom could, with the passage of many generations, become a tradition. As well, a custom could become a force of law. Custom was a part of culture. (TOS: "The Cage"; TNG: "Half a Life")

The records of the USS Enterprise revealed to the Talosians that the customs and history of Humans showed an unique hatred of captivity. Even when the captivity was pleasant and benevolent, humans preferred death. (TOS: "The Cage")

A Human custom was "to try and avoid misunderstanding whenever possible." (TOS: "The Corbomite Maneuver")

On Amerind, it was against custom to interrupt a tribal elder at council, even for a medicine chief. (TOS: "The Paradise Syndrome")

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