What is Custom ?
Custom is (noun) 1. a habit, a thing which is usually done It’s a local custom in this part of the world. 2. the use of a shop If the assistants are rude to me again I will take my custom elsewhere. to lose someone’s custom to do something which makes a regular customer go to another place of business, e.g. a restaurant or shop The little corner shops will lose a lot of custom when the new supermarket is built.
source: Easier English, Student Dictionary Upper Intermediate Level