thirteenth chord

noun

Definition of thirteenth chord 

: an eleventh chord with the thirteenth added : a chord that has an interval (see interval sense 2c)of a thirteenth from its lowest to highest note when in root position Thirteenth chords are never seen in the 18th century.

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First Known Use of thirteenth chord

1918, in the meaning defined above

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The first known use of thirteenth chord was in 1918

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