masterclass

UK: /ˈmɑːstə^rklɑːs/

Collins Concise English Dictionary © HarperCollins Publishers::

masterclass / ˈmɑːstəˌklɑːs/ noun

1. a session of tuition by an expert, esp a musician, for exceptional students, usually given in public or on television

WordReference Random House Unabridged Dictionary of American English © 2025

mas′ter class′, 

1. a small class for advanced students, esp. a class in performance skills conducted by a distinguished musician.

• 1950–55