lesson (
http://definr.com/lesson)
n 1: a unit of instruction; "he took driving lessons"
2: punishment intended as a warning to others; "they decided to
make an example of him" [syn:
example, {deterrent
example},
object lesson]
3: the significance of a story or event; "the moral of the
story is to love thy neighbor" [syn:
moral]
4: a task assigned for individual study; "he did the lesson for
today"