A free app for Android, by Merriam-Webster Inc..
The best free app for learning and translating English.
Nglish by Britannica is a free, educational, and interactive dictionary app from the world-renowned Encyclopedia. It will help you improve your English vocabulary.
The app is based on the knowledge of native speakers and contains over 1,000 words and terms. The vocabulary is organized into categories, and you can add your own words to the app and create your own quiz. It also contains quizzes and flashcards to test your knowledge of grammar and spelling.
Nglish contains all the vocabulary that is used in the official tests such as ESL, EFL, TOEFL, and TOEIC for the English language.