chief · adjective always before noun /tʃiːf/Full view
B2 most important or main
Dictionary examples:

The chief problem we have in the area now is the spread of disease.

The weather was our chief reason for coming here.

Learner example:

This is the chief argument of those who do not agree with zoos. (First Certificate in English; B2; Portuguese)

B2 highest in rank
Dictionary example:

He is the chief economic adviser to the government.

Learner example:

Bob Wilson, the chief accountant, had resigned. (First Certificate in English; B2; Greek)

chief · noun C /tʃiːf/
B2 the person in charge of a group or organization
Dictionary examples:

a police chief

A new chief of the security forces has just been appointed.

Learner example:

I saw her one day, and she [told] me that she had been promoted to chief of section. (First Certificate in English; B2; Spanish)

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