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aperture (n.)

early 15c., "an opening, hole, orifice," from Latin apertura "an opening," from apertus, past participle of aperire "to open, uncover," from PIE compound *ap-wer-yo- from *ap- "off, away" (see apo-) + root *wer- (4) "to cover." In optics, diameter of the exposed part of a telescope, microscope, etc., 1660s.

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Definitions of aperture from WordNet

aperture (n.)
a device that controls amount of light admitted;
aperture (n.)
a natural opening in something;
aperture (n.)
an man-made opening; usually small;
From wordnet.princeton.edu