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"power" is also used as a crossword clue. If that's what you saw, the answer is often ability (7 letters).
Definitions
Energy; control; strength
Word origin
From Middle English power, poer, from Old French poeir, from Vulgar Latin potēre, from Latin posse, whence English potent. Compare French pouvoir. Displaced the native Old English anweald.
Used in a sentence
“He has lost the power to speak.”
“On June 8, 1872, the London & North Western Railway obtained powers to quadruple its main line, and a new tunnel was bored for the up and down slow lines.”
“If it is spirits who have power to suffer, it seems they would also have active powers to think and will.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer10 curated clues
01“Ability or electricity”5 letters
02“Ability to act”5 letters
03“Electric supply”5 letters
04“Electricity or strength”5 letters
05“Electricity supply”5 letters
06“Energy for a machine”5 letters
07“Energy or control”5 letters
08“Energy or strength”5 letters
09“Energy supply”5 letters
10“Strength or energy”5 letters
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