GoldenDict

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.

Open Source Freemium Mac OS X Windows Linux Android

Google Dictionary

Google's dictionary extension on Google Chrome. With it, you can double-click any word to view its definition in a small pop-up bubble, or search the complete definition of any word or phrase using the address bar dictionary.

Free Chrome OS Chrome

Dictionary.com

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.

Free Android iPhone Web Windows Phone

WordReference

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

Freemium Android iPhone Web

Wiktionary

Wiktionary is a multilingual, web-based project to create a free content dictionary, available in 158 languages.

Free Open Source Android Web

Merriam-Webster

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. Merriam Thesaurus online https://www .

Free Android iPhone iPad Web

Wordnik

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

Free Web

The Free Dictionary

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...

Freemium Android iPhone Android Tablet Web

Blueseal Dictionary

Comprehensive dictionary of English, German, Spanish and French including synonyms.

Free Mac OS X Windows Linux Android iPhone Chrome OS Web Blackberry

Lion (LEO dictionary)

Lion allows you to send a query to the German-English, -French, -Spanish and -Italian LEO dictionaries (Chinese is currently not supported) with a click of your mouse from almost all MS Windows applications.

Free Personal Windows Android iPhone Blackberry Windows Phone HP webOS S60

Glosbe

Huge collaborative massively multilingual dictionary.

Free Personal Web

SpanishDict

SpanishDict is a Spanish-learning website that offers a Spanish to English dictionary, a Spanish-English translator, video lessons, flashcards, and more.

Free Android iPhone Web

Visuwords

The fun and free way to look up definitions. THE graphical dictionary and visual thesaurus. We love words.

Free Web

Define

Define is the fastest and most lightweight dictionary application you have ever seen on iOS! Define relies only on the internal dictionary Apple hides inside your iOS device. No need to be constantly reliant on an internet connection.

Free Open Source iPhone iPad

Longman English Dictionary Online

The Longman Dictionary of Contemporary English Online is an online version of the CD-ROM of the Longman Dictionary of Contemporary English, Updated Edition.

Free Web

Thesaurus.com

Thesaurus.com is the world’s largest and most trusted free online thesaurus brought to you by Dictionary.com. For over 20 years, Thesaurus.com has been helping millions...

Free Chrome OS Web Google Drive - Docs

NextDict Dictionary

NextDict is a multi-language dictionary and a collection of the most complete English references for English and foreign language learners. The app can be used...

Free Android iPhone