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English definition of “night vision”

night vision

noun [U] uk   us  
the ability to see when it is dark: Children have better night vision than adults.

night vision

adjective [before noun] uk (also night-vision)   us  
used to describe a piece of equipment that helps you to see when it is dark: The troops were slowly advancing through the fields using night vision goggles. night-vision cameras/equipment/technology
(Definition of night vision from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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