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specialist

specialist: listen to British English pronunciationspecialist: listen to American pronunciation /ˈspeʃəlɪst/ noun [C]

Definition

someone who has a lot of experience, knowledge, or skill in a particular subject:
a cancer/software specialist
He's a specialist in childhood illnesses.
specialist advice/help
(Definition of specialist noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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