Most important element; SYN. main, primary, principal.
ETYM Old Eng. chief, chef, Old Fren. chief, French chef, from Latin caput head, possibly akin to Eng. head. Related to Captain, Chapter.
1. The head or leader of any group of people; a commander, as of an army; the head of a tribe, clan, or family.
2. The principal part; the most valuable portion.