Gregorian modes Meaning, Definition & Usage

  1. noun any of a system of modes used in Gregorian chants up until 1600; derived historically from the Greek mode
    medieval mode; Gregorian mode; church mode; ecclesiastical mode.

WordNet


Definitions
  1. the musical scales ordained by Pope Gregory the Great, and named after the ancient Greek scales, as Dorian, Lydian, etc.

Webster 1913