Music notation glossary · Intervals
Tritone
six semitones
In the score
What it means
Exactly half an octave, three whole tones — hence the name. It divides the octave symmetrically and sounds unsettled; in the dominant seventh chord it sits between the third and the seventh.
Related pages
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See AnotonaEvery note on this page is computed, not typed in — following the rule that also makes F# major spell its seventh degree E#, not F.