Term for distinguishing dim/perfect/aug intervals from dim/min/maj/aug ones?

Question

There are two types of intervals, distinguished by their possible qualities: - Unisons, fourths, fifths, and octaves (and their compound variants) may be of perfect or (multiply) diminished/augmented quality - Seconds, thirds, sixths, and sevenths (and their compound variants) may be of minor, major, or (multiply) diminished/augmented quality Is there an established term for distinguishing these two categories? Something like "a fifth is a *foobarian* interval, so its quality cannot be minor". If there is no established term, what would be a good choice? ^{Background: I'm writing some music software and this distinction comes up a lot in my code so I'd like to use the appropriate terminology.}

Answer 1

Just perfect. Perfect intervals are neither major nor minor, so when expanded become augmented, and when decreased become diminished. The chart I've seen has usually been:

diminished <---->| minor <----> Major | <------> Augmented

| Perfect |

But feel free to drop me a message if you have further questions. Because I suspect that I'm not understanding your question as written.

Answer 2

Is "Imperfect" the word you're looking for.