This article is to explain and compare the structure of legal definitions in English, Hungarian and Polish statutory instruments. Legal definitions are a tool enabling to make terms and legal texts more precise and unambiguous. There is a wide array of legal definitions. The following definitions will be discussed in this article: (i) definitions in the form of glossaries, (ii) bracket definitions within clauses, and (iii) non-bracket definitions within clauses. The following types of definitions will be compared: (i) parity definitions (1. classic definitions, 2. limited classic definitions, 3. non-classic definitions and within that category especially incomplete, complete, complete blank and partial definitions, 4. aggregative definitions), (ii) non-parity definitions (1. iconographic definitions and 2. conditional definitions).