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What is the noun for apertions?

What's the noun for apertions? Here's the word you're looking for.

aperture
  1. An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole
  2. (optics) Something which restricts the diameter of the light path through one plane in an optical system.
  3. (astronomy) The diameter of the aperture (in the sense above) which restricts the width of the light path through the whole system. For a telescope, this is the diameter of the objective lens.
  4. (spaceflight, communication) 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. (mathematics) The maximum angle between the two generatrices.
  6. Synonyms:
  7. Examples:
    1. “I placed it over me, slipping my head through the aperture at the top and then ripping small holes in the side for my arms.”
      “The widest zone begins with a belt, composed of two cords and two ribbons, geometrically ornamented, while the aperture is wavily etched.”
      “During speech, singing, or playing a wind instrument, the size of the aperture is narrowed and varied, to produce sounds of different pitch.”
apertion
  1. (archaic) The act of opening.
  2. (archaic) An opening; an aperture.
apertions
  1. plural of apertion
apertures
  1. plural of aperture
  2. Synonyms:
  3. Examples:
    1. “It may be desirable to separate generically the species having the hemispherical apertures, median ciliated pore, and sublateral avicularium.”
      “Consisting of a grid of iris diaphragms, the facade's surface has changing apertures.”
      “The supplied inserts include apertures, posts of various widths, and cross hairs.”
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