prepositional phrase

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A phrase that consists of a preposition and its object and has adjectival or adverbial value, such as in the house in the people in the house or by him in The book was written by him.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun grammar a phrase that has both a preposition and its object or complement; may be used as an adjunct or a modifier.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a phrase beginning with a preposition