# AiOne英語辞書 > A comprehensive English-English-Japanese dictionary featuring over 2 million headwords and over 2.2 million example sentences. Canonical page: [https://chrome-stats.com/d/jp.learningscience.aionedict](https://chrome-stats.com/d/jp.learningscience.aionedict) ## Overview - **ID:** `jp.learningscience.aionedict` - **Platform:** Android - **Type:** Android app - **Status:** Available - **Publisher:** Learning Science, Inc. - **Category:** EDUCATION - **Downloads:** 8,237 - **Last updated:** 2026-07-28 - **First published:** 2026-07-28 - **Publisher country:** JP - **Data as of:** 2026-10-27 - **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=jp.learningscience.aionedict) - **Website:** [https://aione.learningscience.jp/](https://aione.learningscience.jp/) - **Privacy policy:** [https://aione.learningscience.jp/privacy](https://aione.learningscience.jp/privacy) ## Description This is a full-featured English dictionary that is completely free and ad-free.

It includes over 2 million English-English-Japanese headwords, over 600,000 Japanese-English headwords, and over 2.2 million example sentences.

It features an unlimited vocabulary list and a genre-based list of frequently used words.

For business or exam preparation, this one English dictionary is all you need.

[Features of AiOne English Dictionary]

1. Uses the world's largest open dictionary data
- Uses an open-source dictionary compiled and checked by native speakers worldwide, allowing you to learn the latest terminology definitions.
- Includes over 2 million English-English-Japanese headwords, over 600,000 Japanese-English headwords, and over 2.2 million example sentences.
- We plan to regularly add new words and example sentences.

2. Understand nuances with English-English-Japanese
- Switch between English-Japanese, English-English, and English-English-Japanese, allowing you to accurately grasp subtle differences in meaning that cannot be conveyed through Japanese translation alone.

3. Acquire practical, real-world English expressions
- Includes a wealth of idiomatic expressions and examples extracted from a wide range of corpora, from business to sports.

4. Frequently Used Word Lists for Busy Business Professionals and Exam Takers
- Includes rankings of frequently used words in 6 fields, including those for exam preparation.
- Aim for efficient vocabulary improvement by checking the list of approximately 15,000 frequently used words.

5. Completely Free, No Ads
- All features are free and ad-free.
- There are no limits on the number of words you can register in your vocabulary list.

* User account registration (free) is required to use all features.
* We may send advertisements for our products via email, etc.

[Terms of Use and Privacy Policy]
Terms of Use: https://aione.learningscience.jp/terms
Privacy Policy: https://aione.learningscience.jp/privacy
* Please check the above Terms of Use and Privacy Policy before use.
* By installing, you are deemed to have agreed to all of the above. ## Rankings - #621,979 — Overall ## Similar extensions and apps - [English japanese dictionary](https://chrome-stats.com/d/com.fiftyThousandWord.japanese) — 641 users - [All英語辞書, English ⇔ Japanese](https://chrome-stats.com/d/com.copyharuki.englishjapanesedictionaries) — 222,974 users - [英語辞書・英和辞典・翻訳 - 英辞郎 on the WEB](https://chrome-stats.com/d/jp.co.alc.eow) — 728,269 users, 4.47 / 5 - [英和辞典アプリ - 発音や例文、オフライン対応の英語辞書](https://chrome-stats.com/d/jp.co.studyswitch.dictionaryeiwa) — 74,382 users - [English Japanese Dictionary](https://chrome-stats.com/d/com.japanesedictionary.app) — 984 users - [English-Japanese Dictionary JP](https://chrome-stats.com/d/com.iziapp.dictappja) — 123 users - [英日字典王](https://chrome-stats.com/d/com.naoto.engjapmightydictionary) — 16 users - [English Japanese Dictionary](https://chrome-stats.com/d/com.smartappspro.japanesedictionary) — 1,779 users - [新編 英和活用大辞典 （研究社）](https://chrome-stats.com/d/jp.co.kgc.android.oneswingviewer.WKENE003G) — 104 users - [英語辞書 - 音声・単語帳機能付き](https://chrome-stats.com/d/com.topleftsoft.englishdictionary) — 48,506 users - [ジーニアス英和大辞典](https://chrome-stats.com/d/jp.co.logovista.dic.GENIUSEB) — 209 users - [Japanese English Dictionary](https://chrome-stats.com/d/vocaja.com.japanese.english.dict) — 704 users --- Source: [Chrome-Stats](https://chrome-stats.com/d/jp.learningscience.aionedict)