The dictionaries are in alphabetical order so there really is not trick to looking in them. Also, we have Google so dictionaries aren’t really that helpful. Therefore, this question is kind of a scam. Which ever teacher gave you this is playing you. Haha.
Answer:
A theme is something that gives a moral, or something that will happen in the story. If you ever had a birthday party, you would pick the theme of it. Sorta like English. Except it does not have a princess theme, or it could have it.
A theme in English is what the story is going to be about. The story's theme is a squirell.