Custom (noun)

1. A traditional and widely accepted way of behaving or doing something that is specific to a particular society, place, or time.
2. A long-established practice or habit.
3. A feature or manner of behavior or doing something that is specific to a particular person.
4. A product or service that has been modified or made to order according to the buyer's specifications.

Origin:

Middle english custume, from old french costume, from latin consuetūdō, from consuētus ("used, customary"), from consuō ("get used to"). cognate with spanish costumbre, italian costume, portuguese costume.

Examples:

1. It is the custom in that country to bow to elders as a sign of respect.
2. The custom of giving gifts at Christmas is a long-standing tradition.
3. He had a custom of drinking tea every afternoon.
4. The company specializes in custom-made furniture.
5. He ordered a custom-fit suit for his wedding.