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Definition of Tetrachord

Tetrachord Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(n.)
A scale series of four sounds, of which the extremes, or first and last, constituted a fourth. These extremes were immutable; the two middle sounds were changeable.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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tetrachord
\tet"ra*chord\ (?), n. [l. tetrachordon, gr. &?;, from &?; four-stringed; te`tra- (see tetra-) + &?; a chord: cf. f. tétrachorde.] (anc. mus.) a scale series of four sounds, of which the extremes, or first and last, constituted a fourth. these extremes were immutable; the two middle sounds were changeable.

Tetrachord Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
In music theory, traditionally, a tetrachord (, ) is a series of three smaller intervals that span the interval of a perfect fourth, a 4:3 frequency proportion. In modern usage a tetrachord is any four-note segment of a scale or tone row, not necessarily related to a particular system of tuning.

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