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By analogy with clock in. (This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium. Particularly: “Do we know when it was first used? Before computers? Early multi-user computers? Unix?”)
- (computing) To gain access to a computer system, usually by providing a previously agreed upon username and password.
- I would like to log in to check my e-mail, but I can't remember my password.
gain access to a computer system