customer n1 : a person or business that purchases a commodity or service
2 a : a person or entity having an account with a bank or on whose behalf the bank has agreed to collect items
b : a person or entity for whom an issuer issues a letter of credit
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.