Etymology
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adverbial (adj.)

1610s, "pertaining to adverbs;" earlier it meant "fond of using adverbs" (1590s), from Late Latin adverbialis, from adverbium "an adverb" (see adverb). Related: Adverbially (mid-15c.).

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Definitions of adverbial
1
adverbial (n.)
a word or group of words function as an adverb;
2
adverbial (adj.)
of or relating to or functioning as an adverb;
adverbial syntax
From wordnet.princeton.edu