This book shows the evolution of the Concise Oxford Dictionary, a famous and innovative dictionary for native speakers of English. It traces changes in the dictionary from 1911 to recent times. By comparing samples from each edition, the author provides insights into the revisions of the dictionary. The analysis sheds light on the editors’ policy on various aspects of the dictionary’s structure, including definition style, vocabulary selection and sense discrimination. The study shows how the editors abandoned the telegraphic style of definitions and adapted them to the needs of the target users. As the dictionary evolved towards greater user-friendliness, it also aimed at broader vocabulary coverage.