power chordn.Music a loud resonant chord played on the electric guitar in a piece of rock music, usually a root note and its fifth played on the lower strings.
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1972 M. Saunders in Circular 25 Sept. 3/1 The aggro, as the English would call it, comes out in his guitar work (power chords at their ultimate) and song-writing.
2000 Guardian 17 Oct. i. 23/3 Scott chipped out powerchords and chunks of lead guitar.