In a manner related to exposition or explanation; in the style of setting forth and explaining ideas.
Variant form of expositorially, from expositor + -ily. This form uses -ily instead of -ially, a more direct derivation path common in older English texts.
Language has multiple ways to say almost the same thing—expositorially vs. expositorily shows how English evolved with competing suffix patterns, and both remain technically correct even if one is rarely used today.
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