Aperture Definition

Contents

• 1 English
  • 1.1 Etymology
  • 1.2 Pronunciation
  • 1.3 Noun
    • 1.3.1 Usage notes
    • 1.3.2 Related terms
    • 1.3.3 Translations
    • 1.3.4 External links
• 2 Italian
  • 2.1 Noun
  • 2.2 Anagrams
• 3 Latin
  • 3.1 Participle

English

Wikipedia Wikipedia

Etymology

Latin apertura (“opening”) < apertus, past participle of aperire (“to open, uncover”), opposed to operire (“to close, cover”). See aperient.

Pronunciation

• IPA: / ˈæp.ə.tʃə(r), ˈæp.ə.tjʊə(r)/
• (US) IPA: /ˈæp.ɚ.tʃɚ/

Noun

aperture (plural apertures)

1. An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.

   An aperture between the mountains. --Gilpin.

   The back aperture of the nostrils. --Owen.

2. (optics) Something which restricts the diameter of the light path through one plane in an optical system.
3. (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.

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.

Related terms

• aperient

External links

• aperture in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
• aperture in The Century Dictionary, The Century Co., New York, 1911

Italian

Noun

aperture f.

1. Plural form of apertura.

Anagrams

• reputare
• reputerà

Latin

Participle

apertūre

1. vocative masculine singular of apertūrus

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