canonical: https://jentic.com/apis/linguarobot.io/linguarobot # Lingua Robot API Jentic publishes the only available OpenAPI specification for Lingua Robot API, keeping it validated and agent-ready. Lingua Robot is a text-processing and dictionary API providing access to over 800,000 English lexical entries including words, phrasal verbs, and multi-word expressions. Two endpoints expose word lookup with definitions, IPA transcriptions, audio pronunciations, inflections, and morphemic analysis, plus a lemmatization endpoint that reduces text to base forms. Authentication uses a RapidAPI key supplied in the X-RapidAPI-Key header. ## For AI agents Look up English word definitions with pronunciations, inflections, and morphemes, and lemmatize free text via 2 RapidAPI-key-authenticated endpoints. ## Scope Does not handle translation between languages, grammar checking, or text generation - use for English dictionary lookup and lemmatization only. ## Capabilities - Look up English word definitions with parts of speech, IPA transcriptions, and audio pronunciations - Retrieve inflection forms and morphemic analysis for English words - Lemmatize free English text to recover base word forms for downstream NLP - Resolve phrasal verbs and multi-word expressions across an 800,000-entry lexicon - Pull example usages and synonyms attached to each lexical entry ## Use cases ### Language Learning Apps Power dictionary lookups in language-learning apps with definitions, IPA transcriptions, and audio pronunciations. The `/language/v1/entries/en/{word}` endpoint returns a structured lexical entry suitable for flashcards and reader overlays. Replaces scraping public dictionaries with a clean structured response. Example prompt: Fetch the dictionary entry for 'serendipity' and return its definition, IPA, and pronunciation audio URL ### NLP Preprocessing Lemmatize English text upstream of search indexing or classification to improve recall on inflected queries. POST `/language/v1/entries/en` accepts free text and returns base-form lemmas. Useful for search engines and content classifiers handling user-generated text. Example prompt: Lemmatize the paragraph 'The runners were running fastest yesterday' and return the lemmas ### Vocabulary Coaching Surface inflections, morphemic breakdowns, and example usages to help learners and writers expand vocabulary precisely. The lexical entry includes inflections and morpheme structure that flashcard apps can render in detail. Replaces multiple disconnected dictionary sources with one structured response. Example prompt: Get the inflection forms and morphemes for 'unbreakable' and use them in a vocabulary lesson ### AI Agent Writing Assistant An AI agent uses Jentic to call Lingua Robot when a user asks for definitions, pronunciations, or lemmatization while drafting. The agent composes the dictionary lookup and lemmatize endpoints to produce structured responses. Credentials stay isolated through Jentic so the RapidAPI key never enters the prompt. Example prompt: Search Jentic for 'lemmatize English text', load the operation schema, and execute it on a user's draft paragraph ## Key resources - **Language** — English dictionary lookup and lemmatization endpoints ## Why Jentic - **Setup:** Wiring the Lingua Robot API by hand means setting the X-RapidAPI-Key header, working within the RapidAPI request tiers, and calling the lingua-robot RapidAPI host yourself. Through Jentic you install once, import the Lingua Robot API from the API Directory, store the key once, and your agent calls it. - **Permission scoping:** Lingua Robot is read-only English dictionary lookup, with the word carried in the path (`/language/v1/entries/en/{word}`), so scope the agent to the lookup and lemmatization operations it needs. You leave out any operation you do not want it to run, so it only calls the ones you allow. - **Credential handling:** Your Lingua Robot RapidAPI key is stored once, encrypted, by your own Jentic One instance and injected at execution time. It never enters the agent's prompt, logs, or context. - **Discovery method:** Agents search Jentic by intent such as 'lemmatize English text' or 'look up a word definition', and Jentic returns the matching Lingua Robot operation with its request and response schema so the agent calls the right endpoint without browsing the reference docs. ## Related APIs - **Wordnik** — English dictionary API with broad coverage and example sentences - **Merriam-Webster Dictionary** — Authoritative English dictionary entries from Merriam-Webster - **Oxford Dictionaries** — Oxford English dictionary lookups with multi-language support ## FAQ ### Why is there no official OpenAPI spec for Lingua Robot API? Lingua Robot does not publish a maintained OpenAPI specification. Jentic generates and maintains this spec so that AI agents and developers can call the Lingua Robot API via structured tooling. It is validated against the live API and kept up to date. Get started with Jentic One, the self-hosted execution layer. ### What authentication does the Lingua Robot API use? Lingua Robot is distributed via RapidAPI and uses an API key in the X-RapidAPI-Key header. Through Jentic, the key is stored in your Jentic One instance and injected at execution time so it never enters the agent's prompt. ### Can I lemmatize free text with the Lingua Robot API? Yes. POST `/language/v1/entries/en` accepts a body of English text and returns the lemmatized base forms. Useful for preprocessing search indexes and classification pipelines. ### What are the rate limits for the Lingua Robot API? Rate limits are governed by the RapidAPI subscription tier the consumer chooses on the Lingua Robot listing. Free tiers cap monthly calls; paid tiers scale call volume. Check the RapidAPI dashboard for current quotas. ### How do I look up a word definition through Jentic? Run pip install jentic, then search Jentic with 'look up an English word definition' to retrieve GET `/language/v1/entries/en/{word}.` Execute it with the target word; Jentic handles the X-RapidAPI-Key automatically. ### Is the Lingua Robot API free? Lingua Robot offers a free RapidAPI tier with a monthly call cap. Higher-volume usage requires a paid RapidAPI subscription on the Lingua Robot listing. ### Can I limit what my agent is allowed to do with the Lingua Robot API? Yes. Because you run Jentic One yourself, your own rules decide which Lingua Robot operations the agent may call and which credentials it may use. Lingua Robot is read-only English dictionary lookup, so you can scope the agent to just the word lookup at GET `/language/v1/entries/en/{word}`, the lemmatization endpoint at POST `/language/v1/entries/en`, or both. Any operation you do not allow is simply left out, so the agent only calls the ones you grant.