Lewis & Short

ăpertūra, ae, f. [aperio] (only post Aug.).

  1. I. An opening (abstr.), Vitr. 4, 6 fin.; Dig. 28, 5, 3.
  2. II. An opening (concr.), aperture, a hole, Vitr. 5, 5; so id. 10, 9: Vulg. Amos, 4, 3; 9, 11.