A person who cites or quotes someone or something as evidence, authority, or example.
From the verb 'cite' plus the agent noun suffix '-er', which creates 'one who does the action.' This follows the standard English pattern of forming agent nouns from verbs (teacher from teach, runner from run).
Citers have enormous power in shaping narratives—a scientist who cites certain studies over others literally determines which ideas get amplified in their field, which is why citation bias is a real problem in research and why tracking who cites whom reveals hidden intellectual communities.
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