Lewis & Short

ĭtĭnĕrārĭus, a, um, adj. [iter],

  1. I. of or belonging to a journey or march, itinerary (late Lat.): sumptus, Lampr. Commod. 9: motus, the motion of travelling, Amm. 21, 15, 2.
  2. II. Subst.: ĭtĭnĕrārĭum, i, n.
    1. A. An account of a journey, an itinerary, Veg. Mil. 3, 6.
    2. B. A signal for marching: itinerarium sonare, Amm. 24, 1.