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English definition of “chief”

chief

adjective [before noun] uk   /tʃiːf/ us  

chief adjective [before noun] (MOST IMPORTANT)

B2 most important or main: The chief problem we have in the area now is the spread of disease. The weather was our chief reason for coming here.

chief adjective [before noun] (PERSON IN CHARGE)

B2 highest in rank: the chief fire officer/accountant

chief

noun [C] uk   /tʃiːf/ us  
B2 the person in charge of a group or organization, or the ruler of a tribe: a police chief A new chief of the security forces has just been appointed. [as form of address] UK humorous Can you sign this form for me, chief?
(Definition of chief from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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