noun
custom
KUHS-tuhm/ˈkʌstəm/
A traditional or habitual way of behaving.
This family follows the custom of removing shoes before entering the home.

Etymology
Latin consuetudo covered both personal habit and established usage. English custom likewise applies the idea of habitual practice to the shared traditions of a community.
In context
When her husband died, she continued her business, inheriting his trade contacts and assets according to local custom, which allowed for a greater degree of female economic agency.
More examples
- It is her custom to read before bed.
- Local customs shape how guests greet their hosts.
- We keep the family custom of baking bread on Sundays.
Forms
custom · customs
customary adjective — Usual or traditional in a particular setting.