consultant

/kənˈsʌltənt/
noun
  1. A person who provides expert advice in a particular area, usually for a fee.
    • Before making a decision, the board asked a financial consultant to review the budget.
    • She works as an independent consultant for several tech startups.
    • The company hired a marketing consultant to help launch the new product.
  2. A senior doctor in a hospital who specializes in a particular field and oversees patient care.
    • After the initial tests, the patient was referred to a consultant cardiologist.
    • The consultant surgeon will perform the operation tomorrow morning.
    • The hospital's consultant in pediatrics has over twenty years of experience.
Antonyms
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