Webster's English Dictionary

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chief

1. chief \'che-f\ n [ME, fr. OF, head, chief, fr. L caput head - more at 
   HEAD] 1: the upper part of an heraldic field  2: the head of a body or 
   organization : LEADER  3: the principal or most valuable part 
2. chief aj 1: accorded highest rank or office  2: of greatest importance, 
   significance, or influence  - chief.ly avor ;aj
3. chief av archaic  : CHIEFLY