In a manner relating to ecthesis; by way of exposition, setting forth, or rhetorical presentation.
From ecthesis (Greek ekthesis 'exposition') + -ic adjective suffix + -ally adverb suffix. Describes the manner of presenting arguments in rhetorical discourse.
This is an ultra-rare adverb that combines ancient Greek rhetoric with medieval -ally adverb formation—you almost certainly won't encounter it in modern writing, making it a true museum piece of English vocabulary.
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