WordNet

WordNet® is a large lexical database of English.

16 Alternatives To WordNet

Anki

Anki is a program which makes remembering things easy. Because it’s a lot more efficient than traditional study methods, you can either greatly decrease your time spent studying, or greatly increase the amount you learn.
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Artha

Artha is a handy thesaurus based on WordNet with distinct features like global hotkey look-up…

Classic Thesaurus

crowdsourced thesaurus

Gnome Dictionary

GNOME Dictionary is a simple, clean, elegant application to look up words in
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Google

Google Search, also referred to as Google Web Search or simply Google, is a web search engine developed by Google. It is the most used search engine on the World Wide Web
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Longman English Dictionary Online

The Longman Dictionary of Contemporary English Online is an online version of the CD-ROM of the…

Moby Thesaurus

30,000 root words, 2.5 million synonyms andrelated words

Power Thesaurus

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

StarDict

StarDict is a Cross-Platform and international dictionary Software.

TemaTres

TemaTres is a Controlled Vocabulary server. Manage, publish, share use and re-use Ontologies, taxonomies, thesauri, list of values. The open source way to manage formal representations of knowledge
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TheSage

TheSage is a powerful language reference system that couples a professional dictionary of the…

Tritrans

TriTrans interactive dictionary. Translate words between English, Spanish and Norwegian.

Wiktionary

Open Source wiki-dictionary by the Wikimedia foundation

WordReference

WordReference is a free online Oxford dictionaries for Spanish, French, Italian, German and more.

WordWeb

One-click lookup in any almost any Windows program; Hundreds of thousands of definitions and synonyms; The latest international English words; Works offline, or reference to Wikipedia and web references.