Etymology
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marker (n.)

Old English mearcere "writer, notary" (glossing Latin notarius "clerk"), literally "one who marks," agent noun from mark (v.). Not found again until late 15c., hence modern use is perhaps a separate formation. Meaning "monument stone" is from 1888. Sense of "took for marking" is by 1725; meaning "felt-tipped marker pen" is from 1951, so called because their purpose was to highlight text.

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Definitions of marker

marker (n.)
some conspicuous object used to distinguish or mark something;
the buoys were markers for the channel
marker (n.)
a writing implement for making a mark;
marker (n.)
a distinguishing symbol;
Synonyms: marking / mark
From wordnet.princeton.edu