This best-selling dictionary is now in its 4rd edition. Specifically written for students of language teaching and applied linguistics, it has become an indispensible resource for those engaged in courses in TEFL, TESOL, applied linguistics and introductory courses in general linguistics. Fully revised, this new edition includes over 350 new entries. Previous definitions have been revised or replaced in order to make this the most up-to-date and comprehensive dictionary available.