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Guidonian

adjective Gui·do·ni·an \ gwēˈdōnēən \
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Definition of Guidonian

: of or relating to the theories of medieval music theorist Guido d'Arezzo; especially : relating to his system of solfège and theory of movable hexachords

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Origin and Etymology of guidonian

Guido d'Arezzo (also called Fra Guittone) †about 1050 Benedictine monk and musical reformer + English -ian

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