lesson

noun [C]

/ˈles.ən/

Definition

A1 a period of time in which a person is taught about a subject or how to do something: How can we make science lessons more interesting? She has never had/taken any acting lessons. He gives French lessons.Classes, courses and coursework B2 an experience that teaches you how to behave better in a similar situation in the future: There is a lesson for all parents in this tragic accident. My parents made me pay back all the money and it was a lesson I never forgot. We can learn important lessons (= gain new understanding) from this disaster.Information and messages

(Definition of lesson noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)