APERTURE • E-FREE TRANSLATION.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

... When the aperture closed, night reigned again, save for the small lamp, "sended" now and again aside, which shed its yellow light. A man in clogs was heard coming down ...

— An Iceland Fisherman • Pierre Loti

... three times on the street door, as she had directed me. Presently the wicket at the side of the door was opened, and a light was held up to it, that my face might be seen by a pair of eyes that peered out through the aperture. A moment later the bolts of the door were drawn, and I was let in by the possessor of the eyes. This was the elderly woman who always attended Mlle. d'Arency when the latter was abroad from the palace. She had invariably shown complete indifference to me, not appearing aware of my existence, ...

— An Enemy To The King • Robert Neilson Stephens

... to a sudden pause. He had incautiously got between Jack and the open door. Now our hero, who was close upon eighteen, and strongly built, was considerably more than a match in physical strength for Foley. He suddenly seized the old man, thrust him through the aperture, then closed the secret door, and sprang for the ...

— Jack's Ward • Horatio Alger, Jr.

... aperture, stood a man, in aviator's dress, with another dimly visible behind him. Both these men held long, blue-nosed, oxygen-bullet-shooting revolvers levelled at the ...

— The Air Trust • George Allan England

... a rifle in the house but no balls could be found. In this extremity one of the women took a musket-ball and placing it between her teeth bit it into pieces. Her eyes streaming with tears, she loaded the rifle and took her position at an aperture from which she could watch the motions of the savages. She dried her tears and thought of vengeance on her husband's murderers and of saving the innocent babes which she ...

— Woman on the American Frontier • William Worthington Fowler

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