Aperture Definition
ăpər-chər
apertures
noun
An opening, such as a hole, gap, or slit.
American Heritage
An opening; hole; gap.
Webster's New World
A usually adjustable opening in an optical instrument, such as a camera or telescope, that limits the amount of light passing through a lens or onto a mirror.
American Heritage
The opening, or the diameter of the opening, in a camera, telescope, etc. through which light passes into the lens.
Webster's New World
The diameter of such an opening, often expressed as an f-number.
American Heritage
Antonyms:
Other Word Forms of Aperture
Noun
Singular:
aperturePlural:
aperturesOrigin of Aperture
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From Latin apertūra (“opening”), from apertus, past participle of aperīre (“to open, uncover”), opposed to operīre (“to close, cover”). See aperient.
From Wiktionary
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Middle English from Latin apertūra from apertus past participle of aperīre to open wer-4 in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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