Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A swirling motion in fluid entering a pump.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

pre- +‎ rotation

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Examples

  • To be able to put the most power into the rotor as possible, it also helps to have a variable pitch propeller, so that during prerotation, the prop can be set to a flat pitch where it doesn't absorb much of the engine power.

    Wired Top Stories Jason Paur 2011

  • During prerotation, the rotor is set to a flat pitch, both to keep it from producing a force to lift the aircraft, and to reduce the induced horsepower, to allow it to be spun to the highest rpm possible.

    Wired Top Stories Jason Paur 2011

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