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WordNet is a lexical database of the English language, which groups English words into sets of synonyms called synsets, provides short, general definitions, and records the various semantic relations between these synonym sets.
ConceptNet is a semantic network containing lots of things computers should know about the world, especially when understanding text written by people.
Roget's Thesaurus is a widely-used English language thesaurus, created by Peter Mark Roget, which groups words with similar meanings into categories.
The Oxford English Dictionary (OED) is a comprehensive and authoritative dictionary of the English language. It provides historical and current meanings of...
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Wiktionary is a multilingual, web-based, free-content dictionary project. It is a collaborative project to produce a free-content multilingual dictionary.
Youdao Dictionary is a popular online dictionary service that provides comprehensive and accurate translations, definitions, and examples.
A comprehensive English dictionary providing definitions, synonyms, and usage examples.
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