Learner's definition of FANTASY
1 : something that is produced by the imagination : an idea about doing something that is far removed from normal reality
His plans are just fantasies.
Her fantasy is to be a film star.
She's living in a fantasy world. [=her ideas or plans are not realistic]
2 [noncount] : the act of imagining something : imagination 3 : a book, movie, etc., that tells a story about things that happen in an imaginary world