A collection of concise but detailed information about a particular subject; a summary or abstract.
From Latin 'compendium' meaning 'a shortcut, abridgment,' from 'com-' (together) plus 'pendere' (to weigh). The idea is weighing many things together to create a condensed but comprehensive summary.
Think 'com-SPEND-ium' — you spend time gathering comprehensive information all in one place! It's like a greatest hits album but for knowledge — all the essential stuff without the filler. The 'weigh together' etymology makes sense: you're weighing all the important points.
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