The study presents a multi-level discourse analysis of the keyword Einheit (at the intratextual and transtextual levels and at the level of actors). The article uses the methods of linguistic description, contextual and corpus analysis of keywords of political discourse. The publication material was a corpus of contexts of the keyword Einheit, made by the authors on the base of political texts of various types (speeches of politicians, memoirs and biographies, texts of party programs, publications in press etc.). Firstly, the authors focus on the morphological, lexical-semantic, and pragmatic characteristics of the keyword Einheit, codified in lexicographical sources. Secondly, the authors study the features of the actualization of the Einheit lexeme as a marker of political discourse in specific use, taking into account the historical and political events that took place in post-war Germany, during the existence of two German states (GDR and FRG), as well as in the united Germany after 1990. The semantic and