Diatonic
/ˌdaɪəˈtɑːnɪk/
Definition 1 of 1
Pro Tip 1/3Scale Context
The term 'diatonic' is typically used to discuss scales and melodies in music theory. 
Her songwriting primarily uses diatonic melodies for their simplicity.
Pro Tip 2/3Harmony Usage
'Diatonic' can describe harmony, referring to chords that come from a single key without chromatic alterations. 
The composer prefers diatonic harmony, avoiding out-of-key notes.
Pro Tip 3/3Western Music
Diatonic is rooted in Western music tradition; other musical traditions might not use the concept. 
Indian classical music does not often employ the diatonic scale.