EN[ˈæp.ə.tʃə(r)] [ˈæp.ə.tjʊə(r)] [ˈæp.ɚ.tʃɚ]
  • In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture of an optical system is the opening that determines the cone angle of a bundle of rays that come to a focus in the image plane.
  • An optical system typically has many openings, or structures that limit the ray bundles (ray bundles are also known as pencils of light).
  • In some contexts, especially in photography and astronomy, aperture refers to the diameter of the aperture stop rather than the physical stop or the opening itself.
  • Part-of-Speech Hierarchy
    1. Nouns
      • Countable nouns
    Related Links:
    1. en apertured
    2. en apertures
    3. en apertureless
    4. en aperture priority
    5. en aperture-priority
    Source: Wiktionary
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    Meaning of aperture for the defined word.

    Grammatically, this word "aperture" is a noun, more specifically, a countable noun.
    Difficultness: Level 3
    Easy     ➨     Difficult
    Definiteness: Level 7
    Definite    ➨     Versatile