Usually means: Light gathering ability of lens.
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We found 11 dictionaries that define the word numerical aperture:

General (4 matching dictionaries)
  1. numerical aperture: Infoplease Dictionary
  2. numerical aperture: Dictionary.com
  3. Numerical aperture: Wikipedia, the Free Encyclopedia
  4. Numerical aperture: TheFreeDictionary.com

Business (2 matching dictionaries)
  1. Numerical aperture, Numerical aperture: Legal dictionary

Computing (1 matching dictionary)
  1. Numerical aperture (microscopy), Numerical aperture (optical fiber), numerical aperture: Encyclopedia

Medicine (3 matching dictionaries)
  1. numerical aperture: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)
  3. Numerical aperture: Medical dictionary

Science (1 matching dictionary)
  1. Numerical Aperture: Eric Weisstein's World of Physics

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Definitions from Wikipedia (Numerical aperture)

▸ noun:  In optics, the numerical aperture of an optical system is a dimensionless number that characterizes the range of angles over which the system can accept or emit light.


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