The inclusion of a large number of semantic relations (SRs) in specialized multilingual dictionaries, facilitated by leveraging the huge capabilities of information technologies for corpus processing, is a new avenue in terminography. Terminological tools that help users acquire and organize knowledge are appreciated by both translators and language learners in specialized fields. This contribution discusses the integration of complex SRs into two multilingual dictionaries, one in the field of retail sales, and the other in global economy. It describes the SR models used, how to integrate them into online dictionaries, and constraints resulting from the choice of techniques and software. The dictionaries discussed illustrate the idea that classes of SRs can reflect the conceptual structure of a given field. Whereas some classes are canonical and common to all fields (relations of generic, specific, part/whole, agent), many are domain-specific. The aim of this contribution is to show how the dictionary’s semantic structure can help users manage their knowledge and facilitate the retrieval of information according to their own needs.