Reference Books

The ultimate language resource! The features of a dictionary—meanings, pronunciations and usage guidance—are combined with the synonym and antonym ...

Features more than 225,000 definitions and over 42,000 usage examples. Includes newly added words and meanings across a variety of fields, includin...

Revised and updated edition. Nearly 70,000 entries, including new words and definitions from the fields of science, technology, entertainment and h...