This article aims to investigate, from an interdisciplinary point of view, the concept of parliamentary immunity. The main objective of this inquiry is to identify the historical premises and the political, linguistic, and legal instruments that determined the conceptualization of parliamentary immunity in light of the main intellectual events in Romania and France. Embracing Reinhart Koselleck's working methods, this research will develop in extenso a comparative conceptual analysis based on methodological rigor, emphasizing not only the importance of the concept after its entry into national languages, but also the political usages of the concept and the present understandings of it.