Which innovative product design feature was FIRST introduced by the Oxford Dictionary app that revolutionized mobile language reference tools?

Modern language learning and reference tools have transformed dramatically with technology. Dictionary apps now employ sophisticated natural language processing, personalized learning algorithms, and innovative UX design to create more intuitive experiences. How well do you know the product design innovations that have revolutionized how we interact with language tools? Test your knowledge of the strategic design choices that have shaped today's most successful dictionary and language learning applications.

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Audio pronunciation with regional accent options
Word Journey feature showing etymology with interactive timelines
Contextual camera translation of printed text
Adaptive vocabulary quizzes based on user search history