The best American English learner's dictionary is better than ever, with new words and new features. Based on the world's largest corpus of written and spoken American English, it includes up-to-date vocabulary (""blog,"" ""podcast,"" ""wiki""), usage notes that help learners avoid common mistakes, frequency information that identifies the words learners need to know, easy-to-understand definitions, and full-sentence examples that show how English is really used. The best American English learner's dictionary is better than ever, with new words and new features.