who /hu/ pron. 1 what or which person: Who are you?||Who was that black-haired man? 2 the person or persons that: I am the woman who just telephoned you. 3 used to give more information about a person or persons: My sisters, who live in Denver, are coming to visit next week.
Usage Note: Who replaces he, she, it, or they in a sentence or question. Who agrees with the subject in number: Who is that guy? Who are your friends? Whom replaces the object of an action in a sentence or question: I gave the book to her. To whom did you give the book? That is the woman to whom I gave the book.
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