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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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a article

  /ə/ , /ˈeɪ/
  • An unspecified example of (something); the indefinite article. [from before 1150]
 un, una

a noun

  /eɪ/ , /æ/ , /ɑː/ , /ə/ , /ˈeɪ/ , /ˈæɪ/ , [ˈeː]
  • The name of the Latin script letter A / a.
 a

a noun

  /ɔ/
  • The name of the Cyrillic script letter А / а.
 a

a- prefix

  /a/ , /eɪ/ , /æɪ/ , /ə/
  • Not, without, opposite of.
 a-

A

excel·lent
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