Longman Dictionary of Contemporary English homepage

supervisor

 noun
     
su‧per‧vi‧sor [countable]
1 someone who supervises a person or activity
2 American English someone who is a member of the city, county etc government in some parts of the US
—supervisory adjective:
I had a supervisory role.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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