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English definition of “marker”

marker

noun [C] (SYMBOL)    /ˈmɑː.kər/ US  /ˈmɑːr.kɚ/
a sign that shows where something is: I've put in some markers where I planted the seeds. She reached the 500-metre marker in record time.Signs, signals and symbolsSpecific signs and symbols
(Definition of marker noun (SYMBOL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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