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aperture noun

  /ˈap.ə.tjʊə/ , /ˈap.ə.t͡ʃə/ , /ˈæp.ɚ.t͡ʃɚ/ , /ˈæp.ɚˌtjʊɹ/ , /ˈæp.ɚˌtʊɹ/ , /ˈæp.ɚˌt͡ʃʊɹ/
  • (astronomy, photography) 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.
 obertura
  • A small or narrow opening, gap, slit, or hole.
 apertura
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