In my paper I would like to consider Ajdukiewicz's theory of meaning as a form of deflationism. This theory was formulated in the thirties and was published in two articles: "Sprache and Sinn" and "Das Weltbild and die Begriffsapparatur". My paper is intended as not only a historical study. Above all I want to interpret some aspects of Ajdukiewicz's construction as a theoretical model of deflationary ideas concerning science. I believe that this will help in examining the capacity of the deflationary account to accommodate some important facts regarding rationality and scientific development.