noun
Usage: usually capitalized P
1. : one of seven diatonic octave species in ancient Greek music consisting of two disjunct tetrachords represented on the white keys of the piano by a descending diatonic scale from D to D — see greek mode illustration
2. : an authentic ecclesiastical mode consisting of a pentachord and an upper conjunct tetrachord represented on the white keys of the piano by an ascending diatonic scale from E to E — see mode illustration