Test takers preparing to take the GRE (Graduate Record Exam) must command a high-level vocabulary to achieve a high score. This book is designed to teach the definitions of 800 words often appearing on the GRE while also familiarizing test takers with how the words are generally used in context. The book opens with a pretest that serves as a diagnostic, then presents the word list with extensive sentence-completion exercises. A following chapter discusses and analyzes essential word roots. The book concludes with a detailed post-test. Answers are given for all exercises and for all questions in the post-test.