2nd edition of the Encarta World English Dictionary. Looks set to rival Chambers, OUP and Collins.
From the publisher's announcement:
This new edition defines the language we use in the 21st century and brings English to life. It includes over 12,000 new terms, over 400,000 words, phrases and meanings, and extensive help to solve spelling and language problems.
NEW - Over 400,000 words, phrases and meanings, with 12,000 new entries - defining our language in the 21st century, plus distinctive coverage of global English.
NEW - Over 2,000 quotations from key figures through the ages
USAGE HELP - The most authoritative advice on using language correctly - including 1,000 common misspellings, help with over 1,000 frequently confused soundalikes and over 800 Usage Notes answering everyday language queries - plus exclusive online language advice to solve tricky linguistic problems.
CLEAR & ACCESSIBLE - The clearest design and layout (with innovative Quick Definitions to guide you to the right meaning fast), the most accessible definitions and over 4,000 items illustrated including photos, diagrams, maps, tables, and charts, and clear pronunciations.
BRINGING LANGUAGE TO LIFE - over 10,000 entries on people, places and cultural associations, thousands of word histories and new Language Heritage Notes on words English has absorbed from other languages