Merriam-Webster's Essential Learner's English Dictionary

A compact and affordable dictionary designed to help students learn spoken and written English as it is actually used.

• More than 54,000 words and phrases cover both American and British English and their differences.
• Includes more than 15,000 idioms, collocations, and commonly used phrases. 
• Over 78,000 example sentences and phrases help clarify definitions.
• Extensive usage guidance is provided through labeling (old-fashioned, technical, informal, humorous, etc.), glosses, count and noncount labeling, usage notes and paragraphs.

Perfect for ESL, EFL, ELL, and TEFL study and instruction.