lesson

lesson /ˈlɛsn̩/ noun
plural lessons
lesson
/ˈlɛsn̩/
noun
plural lessons
Britannica Dictionary definition of LESSON
[count]
1 
a  : an activity that you do in order to learn something
also : something that is taught
b  : a single class or part of a course of instruction
2 
: something learned through experience
— see also object lesson
3 
: a part of the Bible read as part of a church service