As the legislative bodies of democratic nations, parliaments play a fundamental role in society. Consequently the linguistic practices observed in parliamentary discourse are of importance to everyone. This volume brings together leading researchers in areas of corpus linguistics, big data, parliamentary discourse, and historical linguistics in a truly interdisciplinary exploration at the vanguard of big data and corpus methods with the aim to investigate the intersection between linguistic and social change. Making use of both quantitative and qualitative methods, the studies included in this volume range from a focus on explicitly linguistic phenomena to topics that contribute to our understanding of language and society more generally. It breaks new ground in its critical reflection on the conceptual and methodological challenges of using large corpora of parliamentary discourse to study both the specialised language of parliamentary speech and the societies that the parliaments in question represent and govern.