Merriam-Webster's Collegiate Dictionary, 11th ed.

Merriam-Webster's Collegiate Dictionary (Eleventh Edition) is based on the world's largest collection of information about the way the English language is written and spoken in our time—a citation file of over 16 million examples of English words drawn from actual use, more than 1 million collected since the last edition. The volume also includes: well-drafted Definitions and Pronunciations, Extensive cross-referencing, Stories behind the words, Guidance on Synonyms and Usage, Examples of Contemporary Use, Clear and Informative Illustrations and Tables, Extensive Supplementary Back Matter, and Help in using the Dictionary.