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tetrachord

[te-truh-kawrd] /ˈtɛ trəˌkɔrd/
noun, Music.
1.
a diatonic series of four tones, the first and last separated by a perfect fourth.
Origin of tetrachord
1595-1605
First recorded in 1595-1605, tetrachord is from the Greek word tetráchordos having four strings. See tetra-, chord1
Related forms
tetrachordal, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for tetrachord

tetrachord

/ˈtɛtrəˌkɔːd/
noun
1.
(in musical theory, esp of classical Greece) any of several groups of four notes in descending order, in which the first and last notes form a perfect fourth
Derived Forms
tetrachordal, adjective
Word Origin
C17: from Greek tetrakhordos four-stringed, from tetra- + khordē a string
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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