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Definition of first inversion
: the disposition of a triad or seventh chord so that its third is in the bass : the arrangement of notes in a triad or seventh chord so that its third is in the lowest position — compare root position, second inversion, third inversion — see seventh chord , triad illustration
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Merriam-Webster unabridgedWords at Play
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Time Traveler for first inversion
The first known use of first inversion was in 1813
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