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English definition of “watermark”

watermark

noun [C] (RIVER/SEA)    /ˈwɔː.tə.mɑːk/ US  /ˈwɑː.t̬ɚ.mɑːrk/
a mark showing the highest or lowest level that a river or the sea reachesFloods, tides and currents
(Definition of watermark noun (RIVER/SEA) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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