Marginalia Composer is an application that allows users to read multiple documents and e-books at the same time. Reader experience is greatly enhanced by the ability to add to document pages images, videos, YouTube videos, attachments, bookmarks, highlights and URLs. Any page can be copied and attached to any other page of the same or any other document, while pages can also be linked to each other in the same way. Marginalia's smart search engine can look for annotations containing a particular keyword and the search results can be filtered - once the user has found the entry he was looking for, he can open the document at the corresponding page with one click.
In addition to all the definitions from Merriam-Webster's Collegiate Dictionary, this app offers voice search - to let you look up a word without having to spell it - along with synonyms, antonyms, example sentences, Word of the Day, and more.