English Dictionary - Offline is a free and comprehensive dictionary app that offers offline access to over 180,000 words and their definitions. With a highly functional user interface, it boasts several features such as favorite words, bookmarking, and training with flashcards, making it an ideal vocabulary builder.

The app also offers audio pronunciations with text to speech (TTS), notes, history, search autocomplete, and voice search. You can filter your searches by starting or ending with specific letters and even add new words or edit existing ones. Recent searches and clipboard searches are also available. It also has a multi-selection mode, backup and restore functions, and supports Android N and tablet UI.

In addition, the app offers customization options such as night mode, changing text size, application theme color, reordering tabs, and start-up options. You can manage your favorites, bookmarks, notes, and search history. The app's description window opens when you click on a word, and you can minimize and maximize it with the swipe function.