Merriam-Webster's Essential Learner's English Dictionary

An all-new affordable dictionary designed to help students learn spoken and written English as it is actually used. More than 54,000 words and phrases. Coverage of both U.S. and British English and their differences. More than 15,000 idioms, collocations, and commonly used phrases from American and British English. Clarifies definitions with over 74,000 example sentences and phrases. Usage guidance through extensive labeling (old fashioned, technical, informal, humorous, etc); glosses (restatements to explain example phrases); count and non-count labeling; usage notes; and usage paragraphs.