Lewis & Short

ĭnambŭlātĭo, ōnis, f. [inambulo].

  1. I. A walking up and down on the rostra (of orators; rare but class.), Auct. Her. 3, 15, 27; Cic. Brut. 43, 158.
    Poet.: tremuli lecti, a moving or shaking to and fro, Cat. 6, 11.
  2. II. Transf., a place to walk in, a walk, promenade, Vitr. 1, 3; Plin. 14, 1, 3, § 11.