tet·ra·chord
| \ ˈte-trə-ˌkȯrd
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Definition of tetrachord
: a diatonic series of four tones with an interval of a perfect fourth between the first and last
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“Tetrachord.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tetrachord. Accessed 2 Aug. 2021.
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Time Traveler for tetrachord
The first known use of tetrachord was in 1603
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