Google Dictionary!

GoldenDict is an open-source dictionary program for PC computers that gives translations of words and phrases for different languages. It allows use of several popular dictionary file formats simultaneously.

The free Dictionary.com app delivers content from Dictionary.com and Thesaurus.com, including nearly a million words and definitions and 90,000 synonyms and antonyms. No internet required!

Wiktionary is a multilingual, web-based project to create a free content dictionary, available in 158 languages. Unlike standard dictionaries, it is written collaboratively by volunteers, dubbed "Wiktionarians", using wiki software, allowing articles to be changed by almost anyone with access to the website.

WordReference is a free online Oxford dictionaries for Spanish, French, Italian, German and more. Conjugations, audio pronunciations and forums for your questions.

Free online dictionary, thesaurus, spanish-english and medical dictionaries, audio pronunciations, Word of the Day, word games, and many more high-quality Merriam-Webster language resources.

ABBYY Lingvo is dictionary software that offers you bilingual and multilingual translation with English, German and Russian as the core starting languages.

dict.cc is not only an online dictionary translating from English and German to 21 languages. Its an attempt to create a platform where users from all over the world can share their knowledge in the field of translations. Every visitor can suggest new translations and correct or confirm other users suggestions. The challenging and most important part of the project is the so-called Contribute! system making this process possible.

Online Dictionary - Multiple dictionaries including: English dictionary, medical dictionary, legal dictionary, financial dictionary, computer dictionary, thesaurus, dictionary of acronyms and abbreviations, dictionary of idioms, thesaurus, Columbia encyclopedia, Wikipedia encyclopedia, examples from classic literature, pronunciations, word browser, glossary.

Vocabulary.com is the easiest, most intelligent way to improve your vocabulary. It combines an adaptive learning system (The Challenge) with the world’s fastest dictionary (The Dictionary) so that you can more quickly and more efficiently learn words.

Power Thesaurus is a fast, comprehensive and easy-to-follow online thesaurus for writers, journalists, students and teachers

Reference.com offers a massive online dictionary, thesaurus, encyclopedia, quote finder, and translator (powered by Google Translate)- all for free. For the Dictionary.com and Thesaurus.com mobile app, go here. Dictionary.com

Your Mac also comes with a versatile Dictionary application. It also includes to other reference libraries such as thesaurus, Apple glossary, and Wikipedia. With it, you can find definitions, learn of the word's origin, find synonyms and antonyms, or get encyclopedic knowledge about any subject.

Wordnik wants to be a place for all the words, and everything known about them.

Dixio is the solution for all those who care about their languageWho want to learn more and enrich their vocabulary: when you receive a presentation or prepare a document, when you are reading in Internet or preparing your curriculum, writing an e-mail or expanding your knowledge in the Web.

Multilingual dictionary. The Blueseal dictionary provides translations of words and expressions between German, English, Spanish and French in all possible combinations. It also provides a synonym dictionary for all these languages.Mobile version of the site: http://mdict.blueseal.eu/