An adverbial (or adverbial phrase) is a linguistic term for a group of more than one word operating adverbially, when viewed in terms of their syntactic function.

Compare the following sentences:

• I'll go to bed soon.
• I'll go to bed in an hour.
• I'll go to bed after one more TV Tropes article.

In the first, soon is an adverb (as distinct from a noun or verb), and it is an adverbial (as distinct from a subject or object). Clearly, in the second sentence, in an hour has the same syntactic function, though it does not contain an adverb; therefore, a preposition and a noun (preceded by its article) can function together as an adverbial. Such a multi-word adverbial may be called an adverbial phrase. In the third sentence, we see a whole clause functioning as an adverbial. It could also be called an adverbial phrase, but is more likely to be described as an adverbial clause.

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