customer
A person or company who purchases or receives a product or service from a business or merchant or intends to do so.
Example
“Every person who passes by is a potential customer.”
Other meanings
A habitual patron, regular purchaser, returning client; a person or company who has a custom of buying from a particular business.
A person, especially one engaging in some sort of interaction with others.
Word history
From Medieval Latin "custumarius" (a toll-gatherer, tax-collector).
Where this comes from
This definition is adapted from “customer” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.