missa

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missa (Lat.). Mass. Thus one finds missa brevis, short mass; missa cantata, sung mass; missa ad fugam or missa ad canones, mass in fugal or canonic style; missa sine nomine, mass without a name, i.e. comp. (in 15th and 16th cents.) with orig. material and not, as was customary, on an existing plainsong or secular melody.