1) a piece of paper used to vote in secret (ballot)

2) a piece of paper or other material used for describing what something is (label)

3) a short written reminder; a short letter; a piece of paper money (banknote); a single sound of a certain pitch and duration; to notice (something); pay attention to (note)

4) one side of a piece of paper in a book etc; a young male member of a hotel staff; a boy attending a bride at a wedding (page)