An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.
The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture.
aperture in Dutch is mond, gat, opening
aperture in French is orifice, ouverture
aperture in Italian is abboccatura
aperture in Latin is foramen
aperture in Portuguese is abertura
aperture in Spanish is abertura