Which innovative feature was FIRST introduced by Oxford Dictionaries in their digital product that revolutionized how users interact with language resources?

The digital revolution has transformed how we access and interact with language resources. Dictionary products have evolved dramatically from physical books to sophisticated digital platforms with advanced features. This poll tests your knowledge about product innovation in the language resources market and how technology has changed the way we engage with language learning tools.

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Audio pronunciations of words by native speakers from different regions
Intelligent word sense disambiguation based on user context
Integration of user-submitted neologisms and definitions
Personalized vocabulary learning algorithms