- of, relating to, or used as an adverb.
- a word or group of words playing the grammatical role of an adverb, such as in the rain in the sentence I’m singing in the rain
- of or relating to an adverb or adverbial
1610s, “pertaining to adverbs;” earlier it meant “fond of using adverbs” (1590s), from Late Latin adverbialis, from adverbium (see adverb). Related: Adverbially (mid-15c.).