Definition of: lesson

(les′ən) noun
1. A specific exercise to be learned or recited at one time; task assigned by a teacher.
2. Instruction; an instance of instruction.
3. plural A course of instruction.
4. A set portion of any work or writing suitable for reading at one time; a reading; specifically, a portion of Scripture read or appointed to be read in divine service.
5. Knowledge gained by experience.
6. A reprimand; lecture. See synonyms under TASK.
—v.t.
1. To give a lesson or lessons to.
2. To rebuke; scold. ♦ Homophone: lessen. [<OF lecon <L lectio, -onis a reading. Doublet of LECTION.]