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11 Trending Words of 2014

N.A.

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

numerical aperture

noun, Microscopy
1.
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
1875-1880
1875-80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Related Abbreviations for n.a

n.a.

Latin non allocatur (it is not allowed)

N.A.

North America
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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