In a manner that relates to careful explanation or interpretation; in the style of a detailed exposition.
From expositorial + -ly. This is an adverb form of the adjective expositorial, built from the Latin exponere root with multiple suffixes stacked together.
This is one of those delightfully long words that linguists love—it shows how English builds meaning by layering prefixes and suffixes. It's technically correct but so formal that professional writers rarely use it.
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