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Definition of Augmented fourth
1. Noun. (music) A type of tritone in musical composition comprising of six semitones. It spans four diatonic scale degrees like a perfect fourth but with an extension of a semitone. The number of diatonic degrees it spans is what distinguishes it from a diminished fifth. ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Augmented Fourth
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