Relative pronoun

A relative pronoun is a pronoun that marks a relative clause. An example is the word which in the sentence "This is the house which Jack built." Here the relative pronoun which introduces the relative clause. The relative clause modifies the noun house. The relative pronoun, "which," plays the role of an object within that clause, "which Jack built."

In the English language, the following are the most common relative pronouns: which, who, whose, whom, whoever, whomever, and that, though some linguists analyze that in relative clauses as a conjunction / complementizer.