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Definition of aperture:

  1. An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.
  2. The act of opening.
  3. The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four- inch aperture.

Synonyms:

outlet, open, vent.

Usage examples: