(~s)
Frequency: The word is one of the 700 most common words in English.
1.
The ~ of an organization is the person who is in charge of it.
...a commission appointed by the police ~.
...Putin’s ~ of security.
N-COUNT: with supp
2.
The ~ of a tribe is its leader.
...Sitting Bull, ~ of the Sioux tribes of the Great Plains.
N-COUNT; N-TITLE
3.
Chief is used in the job titles of the most senior worker or workers of a particular kind in an organization.
...the ~ test pilot.
= head
ADJ: ADJ n
4.
The ~ cause, part, or member of something is the most important one.
Financial stress is well established as a ~ reason for divorce...
The job went to one of his ~ rivals.
= main, principal
ADJ: ADJ n