kuvitelma

noun
  1. A mental image or concept that is imagined or thought of, often without a basis in reality; a figment of the imagination. noun
    The child's kuvitelma of a magical forest was filled with talking animals and sparkling streams.
    Despite the lack of evidence, he held onto the kuvitelma that he would one day find a hidden treasure.
  2. An idea or belief that is not based on fact or reality; a misconception or illusion. noun
    Her kuvitelma that she could finish the project in one day was quickly proven wrong.
    The notion that he could fly was nothing more than a kuvitelma born of his vivid imagination.