
In music theory, a diatonic scale (or heptatonia prima) is an eight-note musical scale composed of seven pitches and a repeated octave. The diatonic scale includes five whole steps and two half steps for each octave, in which the two half steps are separated from each other by either two or three whole steps, depending on their position in the sca...
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http://en.wikipedia.org/wiki/Diatonic_scale

The usual scale in western music, corresponding to the white notes on a keyboard.
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http://www.hibberts.co.uk/glossary.htm

In music a diatonic scale is a scale consisting of eight sounds with seven intervals, of which two are semitones and five are whole tones; a modern major or minor scale, as distinguished from the chromatic scale.
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http://www.probertencyclopaedia.com/browse/VD.HTM

[
n] - a scale with eight notes in an octave
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http://www.webdictionary.co.uk/definition.php?query=diatonic%20scale

on the modern keyboard, the white keys are considered the diatonic notes, and scales (a series of notes in order from low to high or high to low) that can be made using only those whole-steps and half-steps are considered diatonic scales. In the Middle Ages, the church modes were based on diatonic scales.
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https://www.arlima.net/the-orb/encyclop/culture/music/orbgloss.htm
noun a scale with eight notes in an octave; all but two are separated by whole tones
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https://www.encyclo.co.uk/local/20974

In music, a scale consisting of the seven notes of any major or minor key
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https://www.encyclo.co.uk/local/21221
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