# Wiktionary

**Canonical:** https://apis.io/providers/wiktionary/  
**Website:** https://en.wiktionary.org/  
**APIs profiled:** 11

Wiktionary is the free, collaborative multilingual dictionary project of the Wikimedia Foundation, the dictionary sibling of Wikipedia. Programmatic access is exposed through the MediaWiki Action API at en.wiktionary.org/w/api.php, the older Wikimedia REST API at en.wiktionary.org/api/rest_v1/ (which provides Wiktionary-specific endpoints like /page/definition/{term}), and the newer MediaWiki Core REST API at en.wiktionary.org/w/rest.php. All Wiktionary content is licensed CC BY-SA 4.0 (and GFDL) and hosted by the Wikimedia Foundation.

## Kin Score — 47.7 / 100 (developing)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.5 from 47.2).

| Facet | Score |
|---|---|
| Discoverability | 75.9 |
| Contract Quality | 29.1 |
| Governance | 28.8 |
| Contract Governance | 28.8 |
| Operational Transparency | 34.2 |
| Developer Ergonomics | 52.4 |
| Commercial Clarity | 31.6 |
| Access Clarity | 31.6 |

Regulatory layer — **Government & Public Sector**: 75.9 (matched via tags).

## Agent readiness — 38.9 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | verified |
| OpenAPI Examples | partial |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## APIs (11)

- **Wiktionary Definition API** — Wiktionary-specific structured multilingual definition endpoint
- **Wiktionary ExpandTemplates API** — action=expandtemplates — Expand wikitext templates server-side
- **Wiktionary File API** — File and media metadata
- **Wiktionary History API** — Page history and revision details
- **Wiktionary OpenSearch API** — action=opensearch — OpenSearch suggestions protocol
- **Wiktionary Page API** — Page content, source, and HTML
- **Wiktionary Page Content API** — Page HTML, summary, title metadata, and mobile-optimised HTML
- **Wiktionary Parse API** — action=parse — Render wikitext to HTML and parse section trees
- **Wiktionary Query API** — action=query — Fetch wikitext, extracts, revisions, and search results
- **Wiktionary Search API** — Title-prefix and full-text search
- **Wiktionary Transform API** — Parsoid wikitext ↔ HTML transforms and lint

## Agentic access (1)

- **Wiktionary Agentic Access** — 24 operations · 3 acting

## Security (3)

- **Wiktionary Authentication** — http/oauth2 · 2 schemes
- **Wiktionary Domain Security** — TLSv1.3 · HSTS · DMARC
- **Wiktionary Vulnerability Disclosure** — security.txt · contact published

## Use cases (8)

- **Dictionary Apps** — Embed definitions, etymologies, pronunciations, and translations directly into mobile or desktop dictionary apps.
- **Language-Learning Tools** — Power vocabulary lookups, flashcards, and reading-assistance browser extensions for learners of any language.
- **NLP and Linguistics Datasets** — Use bulk wikitext dumps and the definition API to build morphology, inflection, and word-sense datasets for NLP research.
- **Translation Memory** — Mine cross-language Wiktionary translation tables to seed bilingual dictionaries and translation memories.
- **Spell-Checkers and Tokenizers** — Use the OpenSearch and search endpoints to validate word existence and segment text in tokenizers.
- **AI Grounding and RAG** — Retrieve authoritative definitions to ground LLM responses about word meaning, etymology, and usage.
- **Crossword and Game Generation** — Generate clues, anagrams, and puzzle answers from Wiktionary's definitions and word lists.
- **Linguistic Research** — Query etymologies, declensions, pronunciations, and historical usage across hundreds of languages.

## Tags

Dictionaries, Open-Source, Wikimedia, MediaWiki, Linguistics, Open Data, Public APIs

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/wiktionary/). Scores are computed from the provider's own public artifacts under a published rubric.