1. General: Customer of a professional service provider, or the principal of an agent or contractor.
2. Computing: Hardware device (such as a personal computer) or a software application (such as a word-processor) that requests and makes use of services (such as file-transfer and storage) provided by another computer called the server. Normally, a user interacts (interfaces) only with a client whereas the server might be out of sight. A user logged on to a website is using a client computer (with the browser as the client software) that is connected via internet to a server (website's computer).
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