1 : something that is produced by the imagination : an idea about doing something that is far removed from normal reality [noncount] ▪ His plans are pure fantasy. ▪ He can hardly tell the difference between fantasy and reality. [count] ▪ His plans are just fantasies. ▪ Her fantasy is to be a film star. ▪ romantic/sexual fantasies ▪ She's living in a fantasy world. [=her ideas or plans are not realistic]2 [noncount] : the act of imagining something : imagination
▪ His plans are the product of pure fantasy.3 : a book, movie, etc., that tells a story about things that happen in an imaginary world [count] ▪ I spent my summer reading fantasies. [noncount] ▪ I spent my summer reading fantasy (books).
▪ His plans are the product of pure fantasy.