A free app for Android, by Mart.mn.
This is the most comprehensive and reliable dictionary and reference book available for mobile devices, tablets, and desktop computers. With more than 100,000 words, phrases, and sentences in the English language, you can find exactly what you're looking for, no matter if you're searching for the meaning of a word, the translation of a phrase, or the meaning of a sentence.
Besides, with more than 10,000 words in other languages, you can easily copy and paste from other sources. And if you want to take a quick look at the word, you can easily search it in the database.
In addition, the dictionary has a built-in word trainer that will help you improve your vocabulary.
The software can be used on mobile devices, tablets, desktop computers, and on the web.