In grammar, an antecedent is a word or phrase that is repeated by another word or phrase. An antecedent is most often used with relative pronouns, words like "what", "that", and "who". The pronoun usually begins the relative clause and the antecedent is in the main clause.
I want a book that I can read.
Some more examples:
- Willy said he likes chocolate. - Noun as antecedent
- My eccentric uncle likes chocolate. He tells everyone to buy him chocolate. - Noun phrase as antecedent
- Larry was helpful, and so was Kim. - Adjective as antecedent
- He arrived in the afternoon, when nobody was home. - Prepositional phrase as antecedent