chief (adj.) Look up chief at Dictionary.com
c.1300, "highest in rank or power; most important or prominent; supreme, best," from Old French chief "chief, principal, first" (10c., Modern French chef), from Vulgar Latin *capum (also source of Spanish and Portuguese cabo, Italian capo, Provençal cap), from Latin caput "head," also "leader, guide, chief person; summit; capital city" (see capitulum).
chief (n.) Look up chief at Dictionary.com
c.1300, "head, leader, captain; the principal or most important part of anything;" from Old French chief "leader, ruler, head" of something, "capital city" (10c., Modern French chef), from Vulgar Latin *capum, from Latin caput "head," also "leader, chief person; summit; capital city" (see capitulum). Meaning "head of a clan" is from 1570s; later extended to American Indian tribes. Commander-in-chief attested from 1660s.