Etymology
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spotter (n.)

1610s, "one who makes spots," agent noun from spot (v.). From 1893 in hunting; 1903 in sense "look-out."

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Definitions of spotter

spotter (n.)
a worker employed at a dry-cleaning establishment to remove spots;
spotter (n.)
a worker employed to apply spots (as markers or identifiers);
spotter (n.)
a person employed to keep watch for some anticipated event;
Synonyms: lookout / lookout man / sentinel / sentry / watch / scout / picket
spotter (n.)
someone who is the first to observe something;
Synonyms: finder / discoverer
From wordnet.princeton.edu