Definition of junior common room in US English:

junior common room

noun

British
  • A room used for social purposes by the undergraduates of a college.

    • ‘A University of York spokesman said: ‘TVs are available in the junior common rooms and college accommodation used for conferences on campus.’’
    • ‘Two long blocks containing two floors of undergraduate accommodation face each other across an enormous quadrangle which is completed by the Hall, senior common rooms, junior common rooms, kitchens and offices on one side, and the Wolfson Library and Bernard Sunley Lecture Theatre on the other.’
    • ‘The college was constructed lacking space for student groups’ offices or any of the traditional senior and junior common rooms that the other colleges have.’

Pronunciation

junior common room

/ˈdʒunjər ˈkɑmən rum/