2 definitions found

From WordNet (r) 2.0 [wn]:

adverbial

adjective: of or relating to or functioning as an adverb; "adverbial syntax"

noun: a word or group of words function as an adverb

From The Collaborative International Dictionary of English v.0.44 [gcide]:

Adverbial \Ad*ver"bi*al\, adjective [L. adverbialis: cf. F. adverbial.] Of or pertaining to an adverb; of the nature of an adverb; as, an adverbial phrase or form.
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