This chapter addresses issues concerning terminological knowledge bases (TKBs). A TKB was initially defined at the crossroads of terminology and knowledge engineering as a knowledge base taking into account the twofold nature of a term: conceptual and linguistic. In the case of terminological knowledge bases, a historical perspective is very important because this concept symbolizes the confluence between at least two disciplines: terminology and knowledge engineering. Probably the most important characteristic of a TKB, at least for terminologists, is the fact that knowledge is represented in the form of conceptual relations. The term "knowledge-rich context" was proposed by Meyer in the context of building TKBs. It was defined as "a context indicating at least one item of domain knowledge that could be useful for conceptual analysis". The aim of building conceptual networks from texts as systematically as possible has enabled the improvement of terminological analysis methods using the results of natural language processing tools.