Past tense of catalog: to make a systematic list of items, organize information in an orderly way, or record in a catalog.
From catalog (noun/verb) + -ed (past tense marker). Catalog itself comes from Greek katalogos (kata- 'down' + legein 'to speak'), originally meaning a list of things 'spoken in order.'
The shift from 'catalogued' (British) to 'cataloged' (American) spelling reflects how -og words drop the final -ue in American English, but this mundane spelling choice masks a fascinating history of library science and information organization.
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