IPA: //ˈkʌstəm//
KK: /ˈkʌstəm/
Designed or made specifically for a particular person or purpose, rather than being standard or mass-produced.
She ordered a custom dress for the wedding.
A usual way of doing something that is common in a particular group or region.
It is a custom in our family to celebrate birthdays with a big dinner.
Custom comes from Old French 'costume' (meaning habit or practice), which in turn derives from Latin 'consuetudo' (meaning habit or usage). The word 'custom' refers to a habitual practice or tradition that is commonly accepted within a society.
Think of 'habit' or 'practice' when you hear 'custom' — it helps you remember that a custom is something people do regularly.