Longman Dictionary of Contemporary English homepage

magnification

noun
     
Related topics: Optics
mag‧ni‧fi‧ca‧tion
1 [uncountable]HPO the process of making something look bigger than it is
at high/low etc magnification
When viewed at high magnification it is clear that the crystals are quite different.
greater levels of magnification
under magnification
The colour is evident even under low magnification.
2 [countable]HPO the degree to which something is able to make things look bigger:
binoculars with a magnification of x12 (=which make things look 12 times as big)

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