The first of its kind since the 1980s, this book provides authoritative definitions for more than 2,600 terms that apply to educational research, practice, and theory. The overall focus is on the most critical terms in education as used by current practitioners, yet references to significant historical events in education are also included. Each of the definitions is 25-250 words and has been written by a knowledgeable practitioner or researcher in the field. Included are acronyms and initialisms commonly used in the field, names and descriptions of relevant organizations, and important legal decisions relating to education. An extensive bibliography provides useful sources for further research. This reference work will be valuable for professionals in the K-12 setting, students of education, and educators and researchers in colleges of education. Librarians at academic, public, and school libraries will find the dictionary immensely useful in interpreting education terminology.