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Thematic meaning" sounds like jargon to me. Any piece of literature does have a theme, maybe several. Typically, just to state a theme is to state the meaning of the theme. Say the theme is that life is hard. Only a pedant is going to say, well, what does that mean, as if there is some deeper layer to this theme. So here's my take: if you state a theme in a clear and complete way, you have done what they asked for in their professorial way. The only wiggle room I see here for the pedants is if you try to state a theme like this: money. That's too open-ended, and somebody might follow up by asking, well, what is the meaning of money to this author?? They want you to show command of the literature.