the act of magnifying or the state of being magnified.
the power to magnify. Compare power ( def 20a ).
a magnified image, drawing, copy, etc.

1615–25; < Late Latin magnificātiōn- (stem of magnificātiō). See magnify, -fication

overmagnification, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
magnification (ˌmæɡnɪfɪˈkeɪʃən)
1.  the act of magnifying or the state of being magnified
2.  the degree to which something is magnified
3.  a copy, photograph, drawing, etc, of something magnified
4.  a measure of the ability of a lens or other optical instrument to magnify, expressed as the ratio of the size of the image to that of the object

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1620s, from L. magnificationem, noun of action from magnificare (see magnify).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

magnification mag·ni·fi·ca·tion (māg'nə-fĭ-kā'shən)

  1. The act of magnifying or the state of being magnified.

  2. Something that has been magnified; an enlarged representation, image, or model.

  3. The ratio of the size of an image to the size of an object.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica


in optics, the size of an image relative to the size of the object creating it. Linear (sometimes called lateral or transverse) magnification refers to the ratio of image length to object length measured in planes that are perpendicular to the optical axis. A negative value of linear magnification denotes an inverted image. Longitudinal magnification denotes the factor by which an image increases in size, as measured along the optical axis. Angular magnification is equal to the ratio of the tangents of the angles subtended by an object and its image when measured from a given point in the instrument, as with magnifiers and binoculars.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Another is the trade off between a telescope's field of view and its
Adaptive lenses change magnification without moving.
Note that lenses with larger diameters can be used, but they will provide a
  smaller magnification.
In some cases, the magnification compensates for the low light, though.
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