N a

Dictionary.com Unabridged

N.A.

1.
National Army.
2.
North America.
3.
not applicable.
4.
Microscopy, numerical aperture.

numerical aperture

noun Microscopy.
a measure of the resolving power of a microscope, equal to the index of refraction of the medium in which the object is placed multiplied by the sine of the angle made with the axis by the most oblique ray entering the instrument, the resolving power increasing as the product increases. Abbreviation: N.A.

Origin:
1875–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
n/a
 
abbreviation for
not applicable

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Abbreviations & Acronyms
n.a.
Latin non allocatur (it is not allowed)
N.A.
North America
N/A
  1. not applicable

  2. not available

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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