Sir; Mr; Signior; -- a title in Spain, formerly given to noblemen and gentlemen only, but now common to all classes.
- Used as a courtesy title before the name of a man in a Spanish-speaking area.
- Chiefly British A head, tutor, or fellow at a college of Oxford or Cambridge.
- Chiefly British A college or university professor.
- The leader of an organized-crime family.
- Archaic An important personage.
- To put on (clothing).
- To assume or take on: donned the air of the injured party.