Geoffrey Finch 
Key Concepts in Language and Linguistics [PDF ebook] 

An invaluable glossary of significant language and linguistic terms and concepts designed for students of English Language and Linguistics. The book also provides a very useful overview of the subject as well as covering principal figures in linguistic criticism and their contribution to the subject. Organized into the core subject areas of language and linguistics, it enables the reader to contextualize each particular definition and gain a wider understanding of each topic. This edition has been updated to include more extensive coverage, particularly of language terms.