The artistic (or poetic) definition is one of the components of the world created by the author. It is usually in the formal shape of syntactic structure, typical of definitions, however, it does not meet the requirements of classic or colloquial definition. The artistic definition is subjective in as much as it is a personal suggestion of the author how to define an object or a phenomenon in a particular text. The aim of my study was to establish the linguistic form and the function of poetic definitions in the poems by Jan Twardowski. The analysis, which has been carried out from this angle, provokes some general reflections: 1. In the poetry by Jan Twardowski we can frequently see the poetic definitions in the form of three-piece structu...