A person who attributes something to a source or cause; someone who assigns credit or blame.
From 'attribute' (Latin 'attributus') plus '-er' agent suffix indicating 'one who does.' Standard English word formation for creating agent nouns.
Art historians are classic attributers—they study paintings and figure out who actually created them, especially when signatures are missing. It's detective work: examining brushstrokes, materials, and historical records to assign credit correctly.
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