Free Dictionary API · Free Dictionary API v2

Return dictionary definitions, part of speech, phonetics and pronunciation audio for an English word.

free-dictionary.define-word v0.1.0 active free — no wallet

Community-maintained Tracert listing of the Free Dictionary API. Given a single English word, returns one or more entries with parts of speech, definitions, synonyms and antonyms, phonetic spelling and links to pronunciation audio. Underlying data is derived from Wiktionary (CC BY-SA). Example - GET /api/v2/entries/en/serendipity returns [ { "word": "serendipity", "meanings": [ ... ] } ]. Not affiliated with or endorsed by the Free Dictionary API project.

machine contract: manifest.json · manifest_hash sha256:408430fe55289946…

Explicitly not promised

Languages other than English
Translation between languages
Guaranteed coverage (returns not_found when a word is absent)

Price

Free. No wallet, no account, no payment handshake — rejections cost nothing too.

Contract

Input: application/json · max 128 bytes — Sent as a URL path segment on a GET - append the word to the endpoint (/entries/en/serendipity).
Output: application/json

Input schema (JSON Schema)

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Define word - input",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "word"
  ],
  "properties": {
    "word": {
      "type": "string",
      "pattern": "^[A-Za-z][A-Za-z'-]*$",
      "description": "A single English word to define. Appended to the endpoint path: /entries/en/{word}.",
      "examples": [
        "serendipity",
        "ephemeral",
        "trace"
      ]
    }
  },
  "examples": [
    {
      "word": "serendipity"
    }
  ]
}

Output schema (JSON Schema)

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Define word - output",
  "type": "array",
  "description": "One or more dictionary entries for the word.",
  "items": {
    "type": "object",
    "properties": {
      "word": {
        "type": "string"
      },
      "phonetic": {
        "type": "string",
        "description": "Primary phonetic spelling, when available."
      },
      "phonetics": {
        "type": "array",
        "items": {
          "type": "object",
          "properties": {
            "text": {
              "type": "string"
            },
            "audio": {
              "type": "string",
              "description": "URL to a pronunciation audio clip (may be empty)."
            }
          }
        }
      },
      "meanings": {
        "type": "array",
        "items": {
          "type": "object",
          "properties": {
            "partOfSpeech": {
              "type": "string"
            },
            "definitions": {
              "type": "array",
              "items": {
                "type": "object",
                "properties": {
                  "definition": {
                    "type": "string"
                  },
                  "synonyms": {
                    "type": "array",
                    "items": {
                      "type": "string"
                    }
                  },
                  "antonyms": {
                    "type": "array",
                    "items": {
                      "type": "string"
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "examples": [
    [
      {
        "word": "serendipity",
        "phonetic": "/ˌsɛ.ɹən.ˈdɪ.pɪ.ti/",
        "phonetics": [
          {
            "text": "/ˌsɛ.ɹən.ˈdɪ.pɪ.ti/",
            "audio": "https://api.dictionaryapi.dev/media/pronunciations/en/serendipity-us.mp3"
          }
        ],
        "meanings": [
          {
            "partOfSpeech": "noun",
            "definitions": [
              {
                "definition": "A combination of events which have come together by chance to make a surprisingly good or wonderful outcome.",
                "synonyms": [
                  "chance",
                  "luck"
                ],
                "antonyms": [
                  "Murphy's law",
                  "perfect storm"
                ]
              }
            ]
          }
        ]
      }
    ]
  ]
}

Failure semantics

Code	Meaning	Retriable
not_found	No definition was found for the requested word.	no
rate_limited	The caller was rate-limited by the provider.	yes
unavailable	The community endpoint was unreachable.	yes

Interfaces

native_api — https://api.dictionaryapi.dev/api/v2/entries/en · docs
GET {endpoint}/{word}, e.g. /entries/en/serendipity. No account or key required.
mcp
Invoke via the hosted Tracert gateway (Streamable HTTP); this read executes live and returns a TRACE Receipt.

Operational facts

Expected latency: p50 0.4s · p95 3s
Timeout: 15s — every execution reaches a terminal state
Idempotency: supported

Data handling (declared)

Input retention

Undisclosed — The input is a single dictionary word (no user data). This community project publishes no retention statement.

Training use

Undisclosed

Subprocessors

Free Dictionary API - api.dictionaryapi.dev (upstream provider)
Wiktionary (underlying data source)

Notes

Unofficial free wrapper of a donation-funded community project with no SLA or uptime guarantee. Definition data is derived from Wiktionary and licensed CC BY-SA; retain attribution when redisplaying it. Fields are marked "undisclosed" where the project has not declared them.

Provenance

Integration: unofficial · adapter operated by tracert-labs

Listing maintained by Tracert. Not affiliated with or endorsed by the upstream project.

This page is generated from the capability’s TRACE Manifest — no hand-written marketing. Verify the contract yourself: manifest.json · schema