Reference

Abbreviations, acronyms, and initialisms

A compendium of various dictionaries and encyclopedias

Listing of dictionaries and other resources for many languages

Originally based on Merriam-Webster's Collegiate® Dictionary, Eleventh Edition, the Merriam-Webster.com Dictionary has since been significantly updated and expanded with new entries, additional content and revised definitions.

Synonyms and antonyms using Roget's 21st Century Thesaurus (3 ed.)

Wordnik shows definitions from multiple sources, so you can see as many different takes on a word's meaning as possible.