The definition of a prepositional phrase is a series of words made up of a preposition and its object.
An example of a prepositional phrase is the phrase "from the park," in which "from" is the preposition and "park" is the object.
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.
A phrase consisting of a preposition and the noun or noun substitute that is its object.
Examples include: around, before, for, onto, over, to, through etc.