An Android Dictionary App.
https://play.google.com/store/apps/details?id=com.amimobenja.onlinedictionary&hl=en
A simple online dictionary that defines almost every English word, Phrase, Idiom, Place, Nation. Past World Event etc.
The best way to know it's functionality is to try it out.
Remember, just as the app title suggest.
You have to be online for the app to function effectively. Without internet the app won't function as required. Hence, increase your knowledge through the Online Dictionary App.