Derate meaning

dē-rāt
To lower the rating of (a device), especially because of a deterioration in efficiency or quality.
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To lower the financial rating of (a corporation, for example).
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To reduce the electrical power rating of (a nuclear power plant, furnace, electrical component, etc.) to improve safety, reliability, or efficiency.
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To lower the rated capability of any rated equipment or material.

The derated engine sold at a lower price, but had the same components as the standard model.

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Origin of derate

  • de– rate

    From American Heritage Dictionary of the English Language, 5th Edition

  • de- +‎ rate

    From Wiktionary