aperture Hear it!

aperture definition

ap·er·ture (ap′ər c̸hər)

noun

  1. an opening; hole; gap
  2. the opening, or the diameter of the opening, in a camera, telescope, etc. through which light passes into the lens

Etymology: L apertura < apertus, pp. of aperire, to open < IE *ap-wer-, to uncover < base *ap(o)- away + *wer- to close, cover > warn

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