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fellow (EN)
noun, adjective

noun “fellow”

singular fellow, plural fellows
  1. (informal) a man or boy
    While walking home, I chatted with a cheerful fellow selling flowers.
  2. a member of a college or university who teaches or does research
    After his PhD, he became a fellow at the university to continue his studies.
  3. a member of a professional or learned society
    She was honored to be named a fellow of the Royal Society of Chemistry.
  4. a companion or friend
    The hikers depended on their fellows during the long trek.
  5. (US) a doctor who is receiving advanced training after residency
    The new cardiology fellow is learning specialized procedures at the hospital.

adjective “fellow”

base form fellow, non-gradable
  1. used to describe someone who performs the same activity as you
    She quickly made friends with her fellow travelers on the tour.