Mixing up languages and first encounter. On constructed languages in science fiction

The author of the article discusses a special manner of existence of constructed languages created within the boundaries of science fiction. The subject matter occupies a special place in the general theory and practice of science fiction within the frames of the confrontation of languages and modification of the existing linguistic systems. The article contains a brief outline of constructed languages categorization, in the background of which selected science fiction works focused on language communication, as well as the presentation of two most popular fantasy systems – L'aadan and Klingon