A brief summary or condensed version of a larger work or collection of information; a compendium.
From Latin compendium, originally meaning 'a saving of expense' (com- together + pendere, to weigh or pay). Over time it evolved to mean 'a shortened or condensed version.' The word compend is the older English form before compendium became standard.
Compend is a ghostly ancestor of the more familiar 'compendium'—they're the same word, but compend fell out of fashion. Medieval scholars treasured compends because books were hand-copied and precious; a good summary could replace entire libraries.
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