Check out this list of some useful iPad dictionary apps. The list is not exhaustive and if you have other suggestions then drop them in the comment form below.
" Dictionary is an intuitive, consistent, talking, hyperlinked and integrated English illustrated dictionary and thesaurus, spell checker, vocabulary builder and wikipedia browser. ...."
2- Concise English Dictionary and Thesaurus
" Concise English Dictionary is a premium quality reference for the English language. It is fast, reliable, up-to-date and really easy to use. You will love it!......."
3- Dictionary for iPad
" Dictionary is an intuitive, consistent, hyperlinked and integrated English illustrated dictionary and thesaurus, spell checker, vocabulary builder and Wikipedia browser. ........"
" this is a quick, easy to use word app that is well worth the purchase if you are a frequent dictionary and thesaurus user............"
5- Wordbook English Dictionary
" WordBook is a comprehensive, quick and intuitive dictionary and thesaurus of the English language. It's a great combination of comprehensive contents and fast intuitive interface........."
6- Advanced English Dictionary and Thesaurus
" The WordNet Dictionary and Thesaurus is a large lexical database of English with up to 140,000 entries and more than 1.4 million words, developed by the Cognitive Science Laboratory at Princeton University........."
" Dictionary! is an easy to use, no fluff dictionary app for your iPad. Helps you find words when you need to without getting in your way. ....."
" The British English dictionary and thesaurus: fast searching, spelling suggestions, definitions, usage examples, synonyms and related words - and no adverts. An offline audio version is available separately..."