- 1[countable] an object or a sign that shows the position of something a boundary marker He placed a marker where the ball landed.
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- 2[singular] a marker (of/for something) a sign that something exists or that shows what it is like Price is not always an accurate marker of quality. Peter has put down a marker for (= shown that he is committed to) next year as the best time to launch the new product.
- 3a pen with a thick felt tip
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