The first comprehensive dictionary of the field of sociolinguistics, this is a valuable reference book for students and teachers of sociolinguistics, others concerned with the socially-oriented study of language and those with a professional interest in language. Entries are concise, the style is reader-friendly and numerous cross-references enable readers to follow up links to related terms and concepts. Sociolinguistics is characterised by increasing heterogeneity, and students are faced with a proliferation of theories, concepts and terminology. This is sometimes a minefield, with similar terms used rather differently within different academic traditions. The dictionary provides a broad coverage of sociolinguistics, including macro- and micro-sociolinguistics and a range of approaches within variationist, interactional, critical and applied traditions. In explaining sociolinguistic terminology, the dictionary is able to map out the traditions and approaches that comprise sociolinguistics and will thus help readers find their way around this fascinating but complex subject. The authors have taught and researched widely across different areas of sociolinguistics.They also draw on their experience of working in different geographical areas, including the USA, UK and Europe, Australia, southern Africa and the Indian subcontinent.