Etymology

Noun

1. A section of learning or teaching into which a wider learning content is divided.

   In our school a typical working week consists of around twenty lessons and ten hours of related laboratory work.

2. A learning task assigned to a student; homework.
3. Something learned or to be learned.

   Nature has many lessons to teach to us.

   I hope this accident thought you a lesson!

4. Something that serves as a warning or encouragement.

   The accident was a good lesson to me.

5. A section of the Bible or other religious text read as part of a divine service.