Language Change in the 20th Century: Exploring micro-diachronic evolutions in Romance languages examines the distinctive features that set the study of the 20th century apart from preceding periods. With a primary focus on Romance languages, including Spanish, Italian, French, and Portuguese, the book advocates for the adoption of innovative methodologies to enhance the nuanced retrieval of research data: the use of speaker’s attitudes questionnaires, apparent time constructions, and S-curves. Additionally, new materials are addressed as diachronic data sources: mass-media recordings from radio and TV, colloquial conversations, and sociolinguistic corpora. Results focus on the evolution of discourse markers, address terms, as well as on the influence of specific processes such as colloquialization or external mechanisms on the language changes developed during this period. In sum, the 20th century is presented in this book as a new strand in diachronic studies, rather than another time span.