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English definition of “overlay”

overlay

noun [C]     /ˈəʊvəleɪ/
something such as a transparent layer or image that can be put over something else , for example to add information or show a relationship between two things: The printer is also able to add a watermark or overlay.
information , data , ideas , etc. that are added to existing information : The phone codes could be changed completely , or by an overlay that adds a second area code .
(Definition of overlay noun from the Cambridge Business English Dictionary © Cambridge University Press)
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