A first baseman (1911+ Baseball)
- First-sale doctrine
noun 1. a legal principle allowing the purchaser of a lawfully made copy of a copyright-protected work to sell or give away that copy without permission but not to reproduce it.
- First secretary
noun 1. the chief minister of the National Assembly for Wales
noun, U.S. Army. 1. the senior noncommissioned officer of a company, squadron, etc., responsible for personnel and administration.
noun 1. Delaware (used as a nickname).