1. Preceding all others in time, space or degree
   "the 1st house on the right";
   - first

See also: archetypal, archetypical, basic, early, eldest, firstborn, first-year, freshman [N. Amer], front, initial, introductory, ordinal, original, premier, premiere, primary, prime, prototypal, prototypic, prototypical

Antonym: last

Encyclopedia: 1st, or The Royal Scots Regiment