To make external or visible; to reveal or expose something inner to the outside; a rare term meaning to manifest externally.
From Latin exterior (external) + -ate (verb-forming suffix). This is an extremely rare formation that never established itself in standard English, existing mostly in historical philosophical or medical texts.
This nearly-extinct word was favored by 17th-century philosophers trying to describe how internal thoughts become external actions—it's a word that lost the linguistic competition to simpler verbs like 'express' and 'reveal.'
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