
An adverbial clause{–}also called a subordinate clause{–}is a dependent clause that functions as an adverb; that is, the entire clause modifies a verb, an adjective, or another adverb. As with all clauses, it contains a subject and predicate, although the subject as well as the (predicate) verb may sometimes be omitted and implied, see below. ...
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http://en.wikipedia.org/wiki/Adverbial_clause

Subordinate clause with the function of an adverb in the whole sentence. This means that the adverbial clause adds information to a main clause about circumstances, including time, place, and cause, as in `He dialled 999
to call the fire brigade.`
Found on
https://www.encyclo.co.uk/local/21221
No exact match found.