The Collaborative International Dictionary
Adverbially
Adverbially \Ad*ver"bi*al*ly\, adv. In the manner of an adverb. [1913 Webster] ||
Wiktionary
adverbially
adv. As, or in the manner of, an adverb.
WordNet
adverbially
adv. as an adverb; "the prepositional phrase here is used adverbially"