Lewis & Short

2. gressus, ūs, m. [gradior], a stepping, going, step, course, way.

  1. A. Lit. (poet. and post-class.; cf.: gradus, passus, incessus, ingressus): tendere gressum ad moenia, Verg. A. 1, 410; so in sing., id. ib. 6, 389; 11, 29.
    In plur.: gressus glomerare superbos, Verg. G. 3, 117; 4, 360; Val. Fl. 1, 183; Plin. 8, 12, 12, § 33; Gell. 1, 11, 6; 11, 13, 10.
  2. B. Transf.
    1. 1. Poet., of the course of a vessel: huc dirige gressum, Verg. A. 5, 162.
    2. 2. A pace, as a measure of length, Gromat. Vet. p. 373, 9.