Bookworm is a general purpose dictionary application. It is a good compromise between fast data lookup (sqlite database used) and reasonable storage demands (books are stored in gzip compressed chunks)
Talking SlovoEd Deluxe English-Russian & Russian-English dictionary for Android is a bilingual dictionary for Android containing the high-quality lexical databases from the world most famous publishers
Concise Oxford English Dictionary is the most popular dictionary of its kind around the world and is noted for its clear, concise definitions as well as its comprehensive and authoritative coverage of the vocabulary of the English-speaking world
Librarium Do you enjoy reading Latin but don't have the time to flip through your tattered dictionary? Tap your way through the Latin classics with the Librarium application on Android. Definitions for words are found online, and stored on your Android phone for quick display the next time
"Get the Roget's advantage while on the move. A very handy tool for quick reference to come up with the best words to make a killer presentation or a powerful document. Look up for synonyms for using a word as noun, verb or adjective