Hypertext Webster Gateway: "adverbial"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Adverbial \Ad*ver"bi*al\, a. [L. adverbialis: cf. F. adverbial.]
Of or pertaining to an adverb; of the nature of an adverb;
as, an adverbial phrase or form.
From WordNet (r) 1.7 (wn)
adj : of or relating to or functioning as an adverb; "adverbial
n : a word or group of words function as an adverb
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