EN
Geometria, to jest miernicka nauka (Geometry or the science of measurement) by Stanisław Grzepski was published in 1566. A look at the examined treaty from the angle of the discourse theory makes it possible to notice a living communication process leading to the formation of the paradigm designated by the expert – layman roles in the 16th century scientifi c, educational literature. When sharing information with a novice, an expert reaches for the specialised register vocabulary including, most of all, scientifi c terms being in operation in the field of the 16th-century science. Terminology is a tool for creating a clear worldview, it combines the abstractness of the message with the observation of the practical sphere. The occurrence of terms in a text fulfi lling an educational function legitimises the author as an expert, proves the effectiveness of the solutions dictated by science. Moreover, terms in an educational text, as a record of knowledge, are a functional instrument of ensuring that the reasoning is consistent, making it a logically designed structure that is recipient-friendly in terms of cognition.