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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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