Final answer:
The best definition of theme is the lesson the author is trying to teach the audience.
Step-by-step explanation:
The best definition of theme is the lesson the author is trying to teach the audience. It is the central idea or message that the author wants the reader to take away from the story. Themes can be universal and apply to people in different cultures and time periods, and they are often explored through the experiences and actions of the characters in the story.
Learn more about theme in literature