<p><strong>Noun</strong></p><ul><li>a section into which a course of study is divided, especially a single, continuous session of formal instruction in a subject: The manual was broken down into 50 lessons.</li><li>a part of a book, an exercise, etc., that is assigned to a student for study: The lesson for today is on page 22.</li><li>something to be learned or studied: the lessons of the past.</li><li>a useful piece of practical wisdom acquired by experience or study: That accident certainly taught him a lesson in careful driving.</li><li>something from which a person learns or should learn; an instructive example: Her faith should serve as a lesson to all of us.</li><li>a reproof or punishment intended to teach one better ways.</li><li>a portion of Scripture or other sacred writing read or appointed to be read at a divine service; lection; pericope.</li></ul><p><strong>Verb</strong></p><ul><li>to teach; instruct; give a lesson to.</li><li>to admonish or reprove.</li></ul>