lesson

(noun) a unit of instruction. Example: "He took driving lessons."

(noun) punishment intended as a warning to others. Synonyms: example, deterrent example, object lesson. Example: "They decided to make an example of him."

(noun) the significance of a story or event. Synonyms: moral. Example: "The moral of the story is to love thy neighbor."

(noun) a task assigned for individual study. Example: "He did the lesson for today."