Lewis & Short

oscĭtātĭo, ōnis, f. [oscito], an opening of the mouth wide, a gaping.

  1. I. In gen.: conchas pandentes sese quādam oscitatione, a gaping, Plin. 9, 35, 54, § 107.
  2. II. In partic., a gaping, yawning, Plin. 7, 6, 5, § 42; Gell. 4, 20, 9; Mart. 2, 6, 4.
    1. B. Trop.: sed Bruti senis oscitationes, tediousnesses, tedious writings, Stat. S. 4, 9, 20: non ipse (judex) nostrā oscitatione solvatur, by our languid speaking, Quint. 11, 3, 3.