Merriam-Webster's Dictionary of Basic English

All new edition of a dictionary designed for people with limited English language skills.  Great for ESL students. 

• More than 36,000 entries include inflected forms and variants. 
  
• Concise, easy-to-use definitions. 
  
• Nearly 20,000 usage examples
  
• Over 400 detailed line drawings, many revised. 
  
• Word history paragraphs; special sections including Signs and Symbols; Confused, Misused, and Misspelled Words; and Tables of Weights and Measures.