Lewis & Short

praecursĭo, ōnis, f. [praecurro], a coming or going before.

  1. * I. In gen.: sine praecursione visorum, without a previous occurrence of phenomena, Cic. Fat. 19, 44.
  2. II. In partic.
    1. * A. In milit. lang., a preliminary combat, a skirmish, Plin. Ep. 6, 13, 6.
    2. B. In rhet. lang., a preparation of the hearer, Cic. Top. 15, 59.
    3. C. The office or work of a forerunner, the mission of John the Baptist, Aug. Tract. in Johan. 4, 6.