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Aperture   /ˈæpərtʃər/   Listen
noun
Aperture  n.  
1.
The act of opening. (Obs.)
2.
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."
3.
(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.






Collaborative International Dictionary of English 0.48








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"Aperture" Quotes from Famous Books



... however, presumed to meddle with the remains so awfully guarded by a malediction; and lest any of the idle or the curious, or any collector of relics, should be tempted to commit depredations, the old sexton kept watch over the place for two days, until the vault was finished, and the aperture closed again. He told me that he had made bold to look in at the hole, but could see neither coffin nor bones; nothing but dust. It was something, I thought, to have seen ...
— Seeing Europe with Famous Authors, Volume I. - Great Britain and Ireland • Various

... were completed the Indians cleared the snow from the top of the beaver house, and then broke an opening into the house itself. Into this aperture Sishetakushin peered for a moment, then his hand shot down, and like a flash reappeared holding a beaver by the hind legs, and before the animal had recovered sufficiently from its surprise to bring its sharp teeth into action in self-defense, the Indian struck it a ...
— Ungava Bob - A Winter's Tale • Dillon Wallace

... and the entire band wheeled around the edge of a tract of timber and came out upon the village, pitched on the banks of a stream of water, the tepees grouped in a circle around the chief's wigwam, the blue smoke curling lazily through the aperture at the top, and the welcome smell of cooking meats permeating the place. Swanson was given in charge of a guard and escorted to a vacant tepee, where he was firmly bound, hand and foot, and thrown upon a pile ...
— Jim Cummings • Frank Pinkerton

... ticket-office-like-closet, he opened a door, and beckoned him in, signing to sit down and keep quiet. The closet was darker than the darkest part of the surrounding garret, for the dormer window in it, similar to the one near the table, was boarded up, all but a single irregular aperture, admitting light enough only to reveal the surroundings after lapse of ...
— The Young Seigneur - Or, Nation-Making • Wilfrid Chateauclair

... just going out without saying good-bye to her; but on the stairs he thought how it would hurt her the whole evening when she was left alone. He went back, making an excuse of having left something in his room. The door of his mother's room was ajar. He put his head in through the aperture. He watched his mother for a, few moments.... (What a place those two seconds were to fill ...
— Jean-Christophe, Vol. I • Romain Rolland


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