
Oxford Learner’s Dictionaries
8.0#2 in online dictionariesFrom $9.99 a yearFree planAndroidiOSWebAPI
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It suits advanced-level learners of British or American English, as well as learners seeking grammar practice or academic vocabulary references. Developers can use the API and its sandbox for dictionary data access.
WordWeb suits people who want an English reference tool for definitions, synonyms, examples or translations, including offline lookup. Pro may suit users who need advanced search, custom glossaries or optional dictionaries.