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English definition of “overlay”

overlay

verb [T]     /ˌəʊvəˈleɪ/ (overlaying, overlaid, overlaid)
to cover something with a layer of something else : Sticky tracing paper overlaid on street maps lets travelers chart their course again and again.overlay sth with sth By mapping the entire retail landscape and overlaying it with demographic information , the company is able to isolate store-by-store effects of television ad campaigns .
to add information , data , ideas , etc. to existing information : A computer model overlaid information about age , work experience , and educational attainment .
(Definition of overlay verb from the Cambridge Business English Dictionary © Cambridge University Press)
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