adverbial
adjective
ad·ver·bi·al ad-ˈvər-bē-əl 
: of, relating to, or having the function of an adverb
an adverbial phrase
adverbial noun
adverbially
ad-ˈvər-bē-ə-lē
adverb 
Word History
Etymology
borrowed from Late Latin adverbiālis, from Latin adverbium adverb entry 1 + -ālis -al entry 1
First Known Use
15th century, in the meaning defined above
Kids Definition
adverbial
adjective
ad·ver·bi·al ad-ˈvər-bē-əl
: of, relating to, or used as an adverb