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1. An act or instance of shutting something off; specifically, in
rocketry, an act or instance of shutting off the propellant
flow in a rocket, or of stopping the combustion
of the propellant. Compare burnout.
2. Something that shuts off, or is used to shut off. See fuel
3. Limiting or bounding as in cutoff frequency.
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use