Figment

Figment means something fiction. What is fiction? Fantasy or something made up. What's the term for the definition of something made up? Other than fiction and fantasy, It's a 3 lettered word. A synonym for the word is fib. Now, it must be easy. No, it's not fib! The word is not fib! It's....... wait a minute I'm not supposed to tell you until the next post which is tomorrow. But, if you know the word before tomorrow, please tell me in your comments. The prize is having the pride of winning. Ok, bye!