Chief is defined as the leader of a group.(noun)
An example of a chief is the head of a fire department.
The definition of chief is the highest in authority or the most important.(adjective)
An example of chief used as an adjective is in the phrase the "chief issue" which means the most significant issue.
See chief in Webster's New World College Dictionary
Origin: ME chef, chief, leader < OFr < VL *capum < L caput, head
See chief in American Heritage Dictionary 4
Origin: Middle English chef
Origin: , from Old French
Origin: , from Latin caput, head; see kaput- in Indo-European roots.
Learn more about chief