In a manner relating to dedication; in the style or manner of a dedicator or dedicatory ceremony.
From 'dedicatory' (relating to dedication) plus the adverbial suffix '-ly,' creating an adverb describing how something is done in a dedicatory manner.
This wonderfully rare word shows how English can stack suffixes endlessly—'dedicatorily' means 'in a dedicatory way,' proving that English is both logical and slightly excessive in its word-building.
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