different between concavity vs aperture
concavity
English
Etymology
From Old French concavité.
Morphologically concave +? -ity
Pronunciation
- IPA(key): /k??kæv?ti/
Noun
concavity (countable and uncountable, plural concavities)
- (uncountable) The state of being concave
- (countable) A concave structure or surface
Antonyms
- convexity
Translations
concavity From the web:
- what does concavity mean
- what is concavity on a graph
- what is concavity of a parabola
- what is concavity and convexity
- what does concavity of ppc indicate
- what is concavity in welding
- what does concavity show
- what is concavity test
aperture
English
Etymology
Borrowed from Latin apert?ra (“opening”), from apertus, past participle of aper?re (“to open, uncover”), opposed to oper?re (“to close, cover”). See aperient. Doublet of overture.
Pronunciation
- (Received Pronunciation) IPA(key): /?æp.?.t??(?)/, /?æp.?.tj??(?)/
- (US) IPA(key): /?æp.?.t??/
- Hyphenation: ap?er?ture
Noun
aperture (plural apertures)
- A small or narrow opening, gap, slit, or hole.
- 1860, Samuel Hannaford, Sea and River-side Rambles in Victoria Chapter 7
- In the centre of the fleshy membrane is an aperture leading into a deep cavity, at the bottom of which is placed a prominent piston that may be retracted by muscular fibres provided for the purpose.
- 1860, Samuel Hannaford, Sea and River-side Rambles in Victoria Chapter 7
- (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.
- (spaceflight, communication) 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
Related terms
Translations
Further reading
- aperture in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
- aperture in The Century Dictionary, New York, N.Y.: The Century Co., 1911.
French
Etymology
Borrowed from Latin apert?ra (“opening”). Doublet of ouverture.
Pronunciation
- IPA(key): /a.p??.ty?/
Noun
aperture f (uncountable)
- (phonetics, phonology) opening, openness, aperture
Related terms
- apéritif
- ouvrir
Further reading
- “aperture” in Trésor de la langue française informatisé (The Digitized Treasury of the French Language).
Italian
Pronunciation
- Rhymes: -ure
Noun
aperture f
- plural of apertura
Anagrams
- reputare
- reputerà
Latin
Participle
apert?re
- vocative masculine singular of apert?rus
Spanish
Verb
aperture
- First-person singular (yo) present subjunctive form of aperturar.
- Formal second-person singular (usted) present subjunctive form of aperturar.
- Third-person singular (él, ella, also used with usted?) present subjunctive form of aperturar.
- Formal second-person singular (usted) imperative form of aperturar.
aperture From the web:
- what aperture to use
- what aperture lets in more light
- what aperture to use for landscape
- what aperture blurs the background
- what aperture lets in the least light
- what aperture for portraits
- what aperture to use for family portraits
- what aperture for family portraits
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