Plural of compendium; multiple collections of concise, comprehensive information on particular subjects.
The English plural of compendium, using the regular -s ending instead of the Latin -ia ending (compendia). Both forms are now acceptable, though compendiums dominates in modern English.
The word compendiums represents English doing what it does best: grabbing a Latin word and then 'Englifying' it by adding regular English plural rules. Scholars might prefer compendia, but English speakers naturally say compendiums, which shows how living languages adapt foreign vocabulary to their own patterns.
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