Abstract
On a theoretical level with the support of literature, we offer some definitions of the concept of redundancy, point to the similarities and differences in the perception of this phenomenon in technical, social and pedagogical communication. We point out the positive and negative aspects of redundancy in the teacher's language. The research part is aimed at mapping the presence of redundancy in the language of primary education teachers. We were interested in which grade in the subject of mathematics is redundancy the most represented and whether it may be considered positive or unnecessary. The research was conducted at five primary schools on a sample of twenty teachers. The method of the research was the direct observation of lessons. The accuracy of the observation was ensured by audio recording and its analysis. We have found that redundancy is most often present in the third grade.