Which language learning app was the first to introduce the 'immersive spaced repetition system' that revolutionized vocabulary acquisition and was subsequently acquired by Duolingo for $50+ million?

In the digital era, dictionaries have evolved from bulky physical books to sophisticated mobile applications. This transformation has revolutionized how we access language resources and learn new vocabulary. Test your knowledge about one of the most significant commercial developments in modern linguistics - the emergence of premium dictionary and language learning applications that have changed how we interact with languages.

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