limiter

/ˈlɪmɪtər/
noun
  1. A device or thing that restricts or controls something, such as speed, amount, or access.
    • The car has a speed limiter that prevents it from going over 100 miles per hour.
    • The website uses a download limiter to stop users from taking too much data at once.
    • A noise limiter was installed in the theater to keep the sound at a safe level.
  2. A person or factor that sets boundaries or restricts possibilities.
    • His fear of failure was the main limiter on his career growth.
    • She refused to let her age be a limiter on her dreams.
    • In many projects, the budget is the biggest limiter of what you can achieve.
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