This book presents the current state of knowledge in the vibrant and diverse field of vocabulary studies, reporting innovative empirical investigations, summarising the latest research, and showcasing topics for future investigation. The chapters are organised around the key themes of theorising and measuring vocabulary knowledge, formulaic language, and learning and teaching vocabulary. Written by world-leading vocabulary experts from across the globe, the contributions present a variety of research perspectives and methodologies, offering insights from cutting-edge work into vocabulary, its learning and use. The book will be essential reading for postgraduate students and researchers interested in the area of second language acquisition, with a particular focus on vocabulary, as well as to those working in the broader fields of applied linguistics, TESOL and English studies.