dictionaries APIs

Chinese Character Web is a free API providing definitions, stroke counts, and pronunciations for Chinese characters without requiring an API key.

Chinese Text Project offers a free API to access a massive digital library of pre-modern Chinese texts, including classics like the Analects and Tao Te Ching.

Collins Dictionary API gives developers access to comprehensive bilingual dictionary and thesaurus data for multiple language pairs, including English, Spanish, French, and more.

Free Dictionary provides programmatic access to definitions, phonetics, pronounciations, parts of speech, examples, synonyms via REST API.

Lingua Robot is a dictionary API that provides word definitions, pronunciations, synonyms, antonyms, and related forms for English words via a clean JSON REST interface.

Merriam-Webster's Dictionary API provides authoritative English dictionary and thesaurus data from one of the most trusted publishers in the United States.

The Oxford Dictionaries API provides access to the Oxford English Dictionary's extensive lexical data, including definitions, pronunciations, etymologies, and usage examples.

Synonyms.com API provides synonym, antonym, and thesaurus data for English words, making it useful for writing assistants, word games, and vocabulary tools.

Wiktionary's API gives free access to the entire collaboratively-edited dictionary, covering definitions, pronunciations, etymology, and translations for words in hundreds of languages.

Wordnik is a comprehensive English dictionary API offering definitions, pronunciations, example sentences, related words, and frequency data sourced from a large corpus of text.

Words API gives you instant access to definitions, synonyms, antonyms, examples, and more for over 150,000 English words via a simple REST interface.