les·son / ˈlesən/ • n. 1. an amount of teaching given at one time; a period of learning or teaching: an advanced lesson in math a driving lesson. ∎ a thing learned or to be learned by a student. ∎ a thing learned by experience: the tragedy is a lesson in disappointment. ∎ an occurrence, example, or punishment that serves or should serve to warn or encourage: let that be a lesson to you! 2. a passage from the Bible read aloud during a church service, esp. either of two readings at morning and evening prayer in the Anglican Church. • v. [tr.] archaic instruct or teach (someone). ∎ admonish or rebuke (someone). PHRASES: learn one's lesson acquire a greater understanding of the world through a particular unpleasant or stressful experience. teach someone a lesson punish or hurt someone as a deterrent: they were teaching me a lesson for daring to complain.