The meaning of CUSTOM is a usage or practice common to many or to a particular place or class or habitual with an individual. How to use custom in a sentence. Synonym Discussion of Custom.

custom adverb uk/ˈkʌs.təm/us/ˈkʌs.təm/ in a way that is specially designed for a particular person or purpose:

Custom, habit, practice mean an established way of doing things. Custom, applied to a community or to an individual, implies a more or less permanent continuance of a social usage: It is the …

A custom is an activity, a way of behaving, or an event which is usual or traditional in a particular society or in particular circumstances. The custom of lighting the Olympic flame goes back …

custom a practice followed as a matter of course among a people; a habitual practice of an individual: It is her custom to take a walk every night before dinner.

There are 18 meanings listed in OED's entry for the word custom, one of which is labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

Custom definition: A common tradition or usage so long established that it has the force or validity of law.