Merriam-Webster Dictionary API

dictionaryapi.com

Provides developers access to dictionary and thesaurus content including definitions, etymologies, audio pronunciations, synonyms, and specialized medical, Spanish, ESL, and student vocabulary.

The Merriam-Webster Dictionary API API uses api key authentication; has freemium pricing; offers a free tier (Free for non-commercial use, up to 1000 queries per day per API key, limited to two reference APIs); rate limits: 1000 queries per day per API key (free tier). Verified 2026-07-12 with per-field source links.

Other Verified 2026-07-12 medium confidence

Base URL

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no source

Auth

api_key

dictionaryapi.com ↗

Free tier

Free for non-commercial use, up to 1000 queries per day per API key, limited to two reference APIs

dictionaryapi.com ↗

Pricing model

freemium

dictionaryapi.com ↗

Pricing

Free for non-commercial use; commercial use requires contacting Merriam-Webster to develop business terms on a case-by-case basis

dictionaryapi.com ↗

Rate limits

1000 queries per day per API key (free tier)

dictionaryapi.com ↗

OpenAPI spec

not documented null

no source

MCP server

not documented null

no source