The Collaborative International Dictionary of English v.0.48:

Coction \Coc"tion\, n. [L. coctio.]
   1. Act of boiling.
      [1913 Webster]

   2. (Med.)
      (a) Digestion. [Obs.]
      (b) The change which the humorists[1] believed morbific
          matter undergoes before elimination. [Obs.]
          --Dunglison.
          [1913 Webster]