Merriam-Webster
Dictionary and Thesaurus Data.
About Merriam-Webster
The Merriam-Webster Dictionary API provides programmatic access to dictionary and thesaurus content, including definitions, etymologies, audio pronunciations, and synonyms and antonyms. It also offers specialized vocabulary resources covering medical, Spanish, ESL, and student-friendly content. The API is intended for building word games, educational tools, language-learning applications, and other word-related digital products.
Access requires registering an application to obtain an API key. The API is free for non-commercial use, limited to 1000 queries per day per key and to two reference APIs; commercial use (apps monetized via ads or fees) requires contacting Merriam-Webster directly to arrange approval and business terms.
Key features
- Dictionary and thesaurus content with definitions, etymologies, and audio pronunciations
- Synonyms and antonyms lookup
- Specialized medical, Spanish, ESL, and student-friendly vocabulary references
- API key-based access via registered application
Frequently asked questions
Is there a free tier?
Yes, the API is free for non-commercial use, limited to 1000 queries per day per API key and two reference APIs.
Can I use this for a commercial product?
Commercial use requires contacting Merriam-Webster directly to get approval and negotiate business terms.
How do I get access to the API?
You register an application on dictionaryapi.com, verify your email, and then retrieve your API key from the My Keys page.
Who is this API for?
It's aimed at developers building word games, educational tools, language learning apps, and other word-related applications.
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