Lockout may mean: - Lockout (industry), a work stoppage in which an employer prevents some or all employees from working
- Lockout (telecommunication), a system to prevent unwanted signals
- Lockout device, a buzzer system where the first button press prevents other presses from being recognized
- A daytime period in some hostels during which guests are disallowed from the premises
- A map from the video game Halo 2
- Lockout law, a law to prevent people entering venues between certain times, usually late at night as a crime prevention strategy
- Lockout-Tagout, a workplace safety system to prevent activation of machinery while a worker may be inside
- Regional lockout, a technological practice to prevent media use in a location other than that for which it is intended to be sold
- Lock-out chip, a computer chip that prevents unauthorized software from being used in a video game system
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