What is the definition of a pronoun?
A pronoun is a word that stands in for a noun. Like nouns, pronouns refer to people, things, concepts, or places. Most sentences contain at least one noun or pronoun.
A pronoun can serve as the subject or object in a sentence, and it will usually refer back (or sometimes forward) to an antecedent – the noun that the pronoun stands in for. Pronouns are used to avoid the need to repeat the same nouns over and over.