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Tertian
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- "Tertial" redirects here. For the feathers in a birds wing, see tertials.
In music or music theory, tertian is the quality of a chord constructed from thirds, and other things constructed from thirds such as counterpoint. A third may be either minor (3 semitones) or major (4 semitones). Example: the interval A-C is a minor third, because it encompasses 3 semitones (A-Bb, Bb-B, B-C), and C-E is a major third, because it encompasses 4 semitones (C-Db, Db-D, D-Eb, Eb-E).
Chords which may be considered as built from sixths are actually tertian because of inversion.

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Encyclopedia
- "Tertial" redirects here. For the feathers in a birds wing, see tertials.
In music or music theory, tertian is the quality of a chord constructed from thirds, and other things constructed from thirds such as counterpoint. A third may be either minor (3 semitones) or major (4 semitones). Example: the interval A-C is a minor third, because it encompasses 3 semitones (A-Bb, Bb-B, B-C), and C-E is a major third, because it encompasses 4 semitones (C-Db, Db-D, D-Eb, Eb-E).
Chords which may be considered as built from sixths are actually tertian because of inversion. Example: the interval C-A is a major sixth. The inversion is that the interval A-C defines a minor third.
Note that the root progression between tertian chords is most often not by third but by perfect fifth (or its inversion perfect fourth).
See also
External links
- Definition of in the Merriam-Webster Online Dictionary
- Definition of at dictionary.com
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