Good
It's easy to understand the meaning with some examples, good to use it for my English study. And the words separated by 1-3 stars, which give a clear picture on how to expend the vocabularies with the priority.
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MacmillanDictionary(US Audio) appears to be a legitimate app. AppsHunter Legitimacy Score for MacmillanDictionary(US Audio) is 90/100.
Based on 90 of 100 points across 7 verification signals from App Store and developer data.