D defs.my
Entry 3 senses Webster, 1913

Prolation

· Pro·la·tion · IPA /pɹəʊˈleɪʃən/
01 n. The act of prolating or pronouncing; utterance; pronunciation.
  1. 1.
    The act of prolating or pronouncing; utterance; pronunciation.[Obs.]
  2. 2.
    The act of deferring; delay.[Obs.]
  3. 3.
    A mediæval method of determining of the proportionate duration of semibreves and minims.(Mus.)