Adverbial

In grammar an adverbial is a word (an adverb) or a group of words (an adverbial phrase or an adverbial clause) that modifies or tells us something about the sentence or the verb. The word adverbial is also used as an adjective, meaning 'having the same function as an adverb'. Look at the examples below:

Danny speaks fluently. (telling us more about the verb)
Lorna ate breakfast yesterday morning.

Read more about Adverbial:  The Form of Adverbials, Types of Adverbials That Form Sentence Elements, Distinguishing An Adverbial From An Adjunct