Originally, an interrogative pronoun, later, a relative pronoun also; -- used always substantively, and either as singular or plural. See the Note under What,
- What or which person or persons: Who left?
- Used as a relative pronoun to introduce a clause when the antecedent is a person or persons or one to whom personality is attributed: the visitor who came yesterday; our child, who is gifted; informed sources who denied the story.
- The person or persons that; whoever: Who believes that will believe anything.