One of the mysteries of the English language finally explained.
1Engineering. A graph showing power as a function of some other variable; specifically a graph of the power output of a vehicle or aircraft against engine speed.
2Figurative. Chiefly Business. The current thinking or trend.
3Statistics. A graphical representation of the power function of a statistical test.
Early 20th century; earliest use found in Philosophical Transactions of the Royal Society of London. From power + curve.
power curve/ˈpaʊə kəːv/
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