Arranged into classes or categories; sorted or grouped according to type, quality, or other characteristics.
Past tense of 'class,' which comes from Latin 'classis' (group, fleet, division). The Latin term originally referred to divisions of Roman citizens by wealth.
When libraries 'classed' books using systems like the Dewey Decimal System, they were following a tradition that goes back to Aristotle's attempts to organize all knowledge—it's basically the history of human thinking made visible on shelves.
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