An adverbial phrase.

(grammar) An adverb that connects two clauses; linking adverb.

(grammar) An adverb that modifies an entire clause or sentence rather than a single word or phrase.

(grammar) An adverb that qualifies a predicate with respect to way in which it is true.

(grammar) An adverb that describes the process, manner, or direction of an action.

(grammar) A type of adverb that refers to a location or to a combination of a location and a relation to that location.