To make a compendium of; to condense or summarize information into a brief, comprehensive form.
From compendium plus the verb-forming suffix -ate. This is a back-formation, meaning English speakers created this verb from the noun compendium rather than it evolving naturally from Latin.
Compendiate might be the rarest word in this entire list—it appears in only a handful of historical texts. Yet it represents something fascinating: humans constantly try to create verbs from nouns, and most of these experiments fail silently. 'Compendiate' never caught on because we already say 'summarize' or 'condense.'
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