lesson

The definition of a lesson is something that is to be learned, a learning period or a plan for teaching.

(noun)

An example of a lesson is an English teacher's plan for her next class.

Lesson is defined as to teach, instruct or discipline.

(verb)

An example of lesson is to teach someone to play the guitar.

See lesson in Webster's New World College Dictionary

noun

something to be learned; specif.,
1. an exercise or assignment that a student is to prepare or learn within a given time; unit of instruction
2. the instruction given during one class or instruction period
3. something that needs to be learned (or the event through which it is learned) for the sake of one's safety, well-being, etc.
4. course of instruction: music lessons
a selection, as of Scripture, forming part of a religious service; lection
a rebuke; reproof

Origin: ME lessoun < OFr leçon < L lectio, a reading, hence text, lesson < pp. of legere, to read: see logic

transitive verb

See lesson in American Heritage Dictionary 4

noun

Something to be learned: lessons from observing nature.
a. A period of instruction; a class.
b. An assignment or exercise in which something is to be learned.
c. The act or an instance of instructing; teaching.
a. An experience, example, or observation that imparts beneficial new knowledge or wisdom.
b. The knowledge or wisdom so acquired.
A rebuke or reprimand.
often Lesson A reading from the Bible or other sacred text as part of a religious service.