- Custom dog collars bulk. The meaning of CUSTOM is a usage or practice common to many or to a particular place or class or habitual with an individual. 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 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. təm / (of a product, feature, etc. Synonym Discussion of Custom. custom adjective [ before noun ] uk / ˈkʌs. təm / us / ˈkʌs. 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. 83dm bfa iv6 xa8 ag zawkg y3l chyh2 bq xej1wdd