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Dictionary

ap•er•ture

Pronunciation: (ap'ur-chur), [key]
—n.
1. an opening, as a hole, slit, crack, gap, etc.
2. Also called ap'erture stop". Optics.an opening, usually circular, that limits the quantity of light that can enter an optical instrument.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

apertometer

aperture-priority

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