customer

Any person who defines needs or wants, justifies or pays for part or the entire project, or evaluates or uses the results.

SOURCE: welcom.com

Any person who defines needs or wants, justifies or pays for part or the entire project, or evaluates or uses the results. The customer, the client, and the user may be all one person, or they may be three separate people. The user is the person who will actually use the product being produced, the customer is the person who is contracting for the product, and the client is the person who the project manager reports to during the project.

SOURCE: apm.com