A free app for Android, by Study Center.
The Dictionary of American English is a dictionary that contains more than 46,000 words, phrases, and meanings, which are divided into eight academic categories: English, Social Studies, Science, Mathematics, Technology, Languages, Arts, and Health. The dictionary can be used for both learning and practicing, as it includes useful vocabulary development tools and interactive exercises.
There are more than 20,000 example sentences that can be used for practicing the vocabulary, and these sentences are divided into two categories: learning and practicing. The dictionary can be used for both offline and online learning, as it contains all the vocabulary learners need for school, along with useful grammar and usage boxes.