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aperture: Meaning and Definition of

ap•er•ture

Pronunciation: (ap'ur-chur), [key]
— n.
  1. an opening, as a hole, slit, crack, gap, etc.
  2. Also calledan 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.
See also:
apertometer aperture mask
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