Aperture vs Cavity - What's the difference?

aperture | cavity |

As nouns the difference between aperture and cavity

is that aperture is an opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall while cavity is a hole or hollow depression.

Other Comparisons: What's the difference?




(en noun)
  • An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.
  • * Gilpin
  • an aperture between the mountains
  • * Owen
  • the back aperture of the nostrils
  • (optics) Something which restricts the diameter of the light path through one plane in an optical system.
  • (astronomy, photography) 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. e.g. a telescope may have a 100 cm aperture.
  • (spaceflight, communications) 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 .
  • (mathematics, rare, of a right circular cone) The maximum angle between the two generatrices.
  • If the generatrix makes an angle ? to the axis, then the aperture is 2?.

    Usage notes

    The aperture of microscopes is often expressed in degrees, called also the angular aperture, which signifies the angular breadth of the pencil of light which the instrument transmits from the object or point viewed; as, a microscope of 100° aperture.

    Derived terms

    * aperture priority




  • A hole or hollow depression.
  • A hollow area within the body (such as the sinuses).
  • (dentistry) A soft area in a decayed tooth.
  • Synonyms

    * See also * (dentistry)

    Derived terms

    * buccal cavity * cavity back * cavity batten * cavity coupling * cavity fill * cavity filter * cavity impedence * cavity magnetron * cavity oscillator * cavity radiator * cavity resonance * cavity tray * cavity tuning * cavity vent * cavity wall * oral cavity