On Wednesday, July 7, 2021, Prof. Dr. Francisco Cuena Boy (Faculty of Law, Universidad de Cantabria) will present the first draft of the lemma Contractus & quasi contractus, one of the most important concepts treated in the future Dictionary of the School of Salamanca’s Juridical-Political Language. Taking into account the ancient and medieval legal background of Contractus, and reviewing the main juridical, political and philosophical debates in which this notion was mentioned by the members of the School of Salamanca, Cuena Boy provides a useful archetype that aims to facilitate the writing process of later lemmata in the dictionary.