English definition of “lesson”
/ˈlesən/ noun [C]
SCHOOL › a period of time when a teacher teaches people: The best way to improve your game is to take lessons. She gives French lessons. Lessons start at 9 a.m.
EXPERIENCE › an experience which teaches you how to behave better in a similar situation in the future: My parents made me pay back all the money, and it was a lesson I never forgot.