The work of opening
- an all-natural opening in some thing
- a computer device that manages quantity of light accepted
- an man-made opening; often little
- The work of orifice.
- An opening; an open space; a gap, cleft, or chasm; a passage perforated; a gap; because, an aperture in a wall.
- The diameter of the exposed an element of the object glass of a telescope or other optical instrument; because, a telescope of four-inch aperture.
early 15c., from Latin apertura "an opening," from apertus, past participle of aperire "to start" (see overt).
Any type of opening
(letter.) The work of opening.
- (n.) An opening; an open room; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.
- (letter.) The diameter associated with the exposed part of the object-glass of a telescope or other optical instrument; since, a telescope of four-inch aperture.
Merely to show the dependence of resolving power on aperture it is not necessary to use a telescope at all.