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English definition of “custom”

custom

noun (USUAL WAY)    /ˈkʌs.təm/
B1 [C or U] a way of behaving or a belief that has been established for a long time: a local/ancient custom [+ to infinitive] In my country, it's the custom (for women) to get married in white.Custom, tradition and conformity [S] something you usually do: He left the house at nine exactly, as is his custom.Habitual behaviour
(Definition of custom noun (USUAL WAY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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