Meaning of APERTURE in English

noun the act of opening.

2. aperture ·noun an opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.

3. aperture ·noun the diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture.

Webster English vocab.      Английский словарь Webster.