There are several dictionary definitions for classes and lessons:
A group of students taught together according to a standing or a level or a subject.
A group of students meeting regularly to study a subject under the guidance of a teacher
A number of pupils in a school or a college, pursuing the same studies, ranked together, or graduated in the same year.
A group of students who meet at a regularly scheduled time or period to study the same subject.
A section into which a course of study is divided; (ie) a single, continuous session of formal instruction in a subject; "The class was divided into 50 lessons".
The instruction given during one class or instruction period.
An exercise or assignment that a student is to prepare or learn within a given time.
Something that needs to be learned or the event through which it is learned.
A lesson is a course of instruction or anything instructive.
Something from which a person learns or should learn (ie) an instructive example.
A useful piece of practical wisdom acquired by experience or study.
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