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aperture

Pronunciation: /ˈap.ə.t͡ʃə/

The English word “aperture” has 5 meanings listed here.

noun

  1. A small or narrow opening, gap, slit, or hole.
  2. A hole which restricts the diameter of the lightpath through one plane in an optical system.
  3. The diameter of such a hole which restricts the width of the lightpath through the whole system. For a telescope, this is the diameter of the objective lens.
  4. The (typically) large-diameter antenna used for receiving and transmitting radio frequency energy containing the data used in communication satellites, especially in the geostationary belt. For a comsat, this is typically a large reflective dish antenna; sometimes called an array.
  5. The maximum angle between the two generatrices.

Etymology

From late Middle English, from Latin apertūra (“an opening”), from aperiō (“to uncover, make or lay bare”) + -tūra (“-ure”, action noun suffix). Doublet of overture and apertura.

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