Define tritone: the name used when musicians talk about the interval that spans six semitones, commonly called the augmented fourth or the diminished fifth.
It sounds unsettling, historically earned a reputation as the ‘devil in music’, and now turns up in everything from medieval chants to modern jazz and film scores.
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What Does define tritone Mean?
The phrase define tritone asks you to identify a specific musical interval that equals six semitones, or half steps, on the chromatic scale.
Musicians call that span either an augmented fourth or a diminished fifth depending on notation and harmonic context, but in practice both names refer to roughly the same sonic distance.
Etymology and Origin of Define Tritone
The word tritone comes from Latin roots meaning ‘three tones’, because the interval covers three whole tones in older tuning systems.
In medieval and Renaissance theory it acquired a darker nickname, diabolus in musica, the devil in music, because theorists and church musicians often avoided it as a dissonant clash.
Music history makes clear how attitudes changed: composers gradually embraced the interval for expressive effect, and by the 19th and 20th centuries it had become a common tool for tension and color.
For background reading, see the tritone entry on Wikipedia and the historical perspective at Britannica.
How Define Tritone Is Used in Everyday Language
When non-musicians hear the word tritone they often mean ‘something that sounds eerie or unsettling’, which is a translation of musical effect into plain speech.
1. ‘The movie used a tritone in the soundtrack to make the scene feel ominous.’
2. ‘When you ask musicians to define tritone, they might point to the opening leap in Leonard Bernstein’s ‘Maria’ as a classic example.’
3. ‘Guitarists often call a flattened fifth a tritone and use it to create a heavy, edgy riff.’
4. ‘In jazz lessons people will say: define tritone by explaining the tritone substitution on the dominant chord.’
Those examples show how the term moves between technical definition and everyday description.
define tritone in Different Contexts
In strict music theory, to define tritone is to point to an interval of six semitones, measurable on a keyboard as the gap from C to F sharp, or from B to F.
In classical harmony the tritone has been used as a dissonant interval that resolves to stability, most famously in the Tristan chord by Richard Wagner which centers on that unsettling sound.
Jazz treats the tritone as a harmonic pivot: the tritone substitution replaces one dominant chord with another a tritone away to create smooth voice leading and chromatic movement.
In popular and rock music the tritone often signals darkness or tension; think of how heavy riffs use that interval to sound ‘evil’ or aggressive without any special notation.
Producers and composers for film and games exploit the interval because our ears associate the tritone with unresolved friction, a quick way to raise the emotional temperature.
Common Misconceptions About Define Tritone
One mistake people make when they ask to define tritone is assuming it is intrinsically evil. The interval has expressive qualities, but context makes it sad, ominous, playful, or jazzy.
Another mix-up is calling any dissonant sound a tritone. Not every awkward-sounding interval is a tritone; the term refers specifically to the six-semitone distance.
Some confuse the interval with the tritone substitution concept in jazz. They are related, but a substitution is a harmonic device using chords whose roots are a tritone apart, not just the interval itself.
Related Words and Phrases
When you define tritone you often run into a small family of related terms: augmented fourth, diminished fifth, diabolus in musica, tritone substitution, and diminished chord.
Each term highlights a different angle. Augmented fourth and diminished fifth are interval names. Diabolus in musica is historical. Tritone substitution is a jazz trick. Diminished chords contain tritones as internal tensions.
For quick reads on the augmented fourth and on tritone substitution, see our guides at Augmented Fourth Definition and Tritone Substitution Meaning.
Why Define Tritone Matters in 2026
Define tritone still matters because composers, producers, and musicians keep using the interval to shape emotion and expectation in modern media.
With streaming, video games, and short-form video, small musical gestures matter more than ever. A single tritone placed under action or a tagline can change audience reaction in seconds.
Jazz education and modern harmony courses continue to teach the tritone for its central role in dominant function and chromatic harmony, so if you want to understand contemporary music theory you should be able to define tritone and use it.
For another historical angle, our short piece on the diabolus phrase digs into how a label stuck and then softened: Diabolus in Musica Meaning.
Closing
If someone asks you to define tritone now, you can give a clear answer: an interval of six semitones known as an augmented fourth or diminished fifth, one with a long, colorful history and wide modern use.
It is more tool than monster, a paint stroke that can add unease, surprise, or swing depending on how a composer or player uses it. Go ahead, listen for it in your favorite tracks. You will start hearing it everywhere.