Meaning

noun a preliminary election where delegates or nominees are chosen

noun one of the main flight feathers projecting along the outer edge of a bird's wing

noun (astronomy) a celestial body (especially a star) relative to other objects in orbit around it

originBorrowed from Latin prīmārius (“of the first (rank); chief, principal; excellent”), from prīmus (first; whence the English adjective prime) + -ārius (whence the English suffix -ary); compare the French primaire, primer, and premier. Doublet of premier.

Etymology from Wiktionary, CC BY-SA 3.0