The Advanced English Dictionary allows the student to learn vocabulary, use it correctly, gain command of English expressions, and familiarize him or herself with usage, meanings and set phrases.
Features

71 000 entries, 122 000 words and expressions and 240 000 translations
Many examples of use, idiomatic expressions and phrasal verbs
Includes common technical terms, placenames, acronyms and abbreviations
Both British and American English
Phonetic transcription of English words
More than 5 800 grammar notes
Grammar appendix in both languages
Irregular verb tables, both Spanish and English

A search tool
Featuring various search options to help you find the words you need more easily, including:

A quick search of words while you type
A 'fuzzy filter' for when you are not sure of the correct spelling of a word
A 'keyword' search for finding key words within phrasal verbs
A wild card search facility which can replace a letter or a group of letters

A learning tool
The dictionary app includes a number of features which help you to expand your vocabulary further:

A 'Favourites' feature allows you to create your own categories and lists of words
Your last visited words are all saved in your 'History', so that you can quickly look back at recently checked words
Discover a new word every day with the 'Daily' feature
Ability to have dictionary Word of the Day as a widget on the device home screen
See words in context with example sentences
Online and offline modes supported; the offline mode allows you to download the whole dictionary and work independently from data connections