APERTURE • DICTIONARY ONE.COM • Definition of Aperture

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/ˈæpərtʃər/ Listen

noun

Aperture n.

The act of opening. (Obs.)

An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall. "An aperture between the mountains." "The back aperture of the nostrils."

(Opt.) The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture. Note: The aperture of microscopes is often expressed in degrees, called also the angular aperture, which signifies the angular breadth of the pencil of light which the instrument transmits from the object or point viewed; as, a microscope of 100° aperture.

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Etymology of 'Aperture'

Collaborative International Dictionary of English 0.48

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"Aperture" Quotes from Famous Books

... the door of the audience chamber fell ajar, and through the aperture came, like the sudden chatter of a bird, the high, nasal, but well-bred ...

— The Napoleon of Notting Hill • Gilbert K. Chesterton

... obtained by a small door in the north side to a wheel-stair leading to the upper floors, and visible as a projecting turret at the S.E. angle of the transept. The east window of the sacristy is pronounced remarkable, having two round-headed windows surmounted by a visica-formed aperture. It has a piscina in the south wall near the east end. The apartment next the sacristy may originally have been a parlour, but is now appropriated as a mausoleum. There is an ambry in the south wall near the east end, and the doorway is semicircular ...

— Scottish Cathedrals and Abbeys • Dugald Butler and Herbert Story

... the stained glass had been brought from England. The design of the window showed Jesus blessing little children. Time had dealt gently with the window; but just at the feet of the figure of Jesus a small triangular piece of glass had been broken out. To this aperture Sophy applied her eyes, and through it saw and heard what she ...

— The Martin Luther King, Jr. Day, 1995, Memorial Issue • Various

... out to the raft, carrying the loose end of the rope with them. Mr. Gilder and Grimshaw quickly returned to the land, leaving the burly Plater to make a vigorous attack with an axe against the sides of one of the wheat bins. He soon splintered and tore off a board, leaving an aperture through which a broad stream of wheat rushed out on the deck of the raft. This Plater began to shovel overboard, working with furious energy, as though combating a hated enemy. In ten minutes both bins were empty, and so much of the wheat had ...

— Raftmates - A Story of the Great River • Kirk Munroe

... in the place was dim and uncertain. The only glazed aperture in the shed was a small window at the rear. With considerable interest Ralph strained his gaze in an endeavor to make out his captors. Then in immense ...

— Ralph on the Overland Express - The Trials and Triumphs of a Young Engineer • Allen Chapman

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