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English definition of “marker”

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marker

noun [C]  /ˈmɑr·kər/ us  
a symbol or object that gives information: When the boats reached the halfway marker, the wind started to pick up. A marker is also a type of pen that makes a thick line: She used a yellow, felt-tip marker to highlight certain words.
(Definition of marker from the Cambridge Academic Content Dictionary © Cambridge University Press)
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