From Teflpedia
Disambiguation: adverbial is also an adjective that means "relating to an adverb".

An adverbial (/ædvɜ:(r)bɪəl/) or adverbial phrase (/ædvɜ:(r)bɪəl freɪz/) is a phrase that functions as an adverb; its syntactic function is to modify other expressions, including verbs, adjectives, other adverbials (including adverbs), and sentences - i.e. it says when, where or how something happens.


Compare adjectival.