- Adjective. Primary; most important in a group.
- Noun. (context, finance) The money originally invested or loaned, on which basis interest and returns are calculated.
- Noun. (North America, Australia) The principal administrator of a school.
- Noun. (legal) One who directs another (the agent) to act on one's behalf.
- Noun. (legal) The primary participant in a crime.
- Noun. A company represented by a salesperson.
- Noun. (North America) A partner or owner of a business.