Which innovative feature was FIRST introduced in digital dictionaries that revolutionized their product development and marketing strategy?

Digital dictionaries have revolutionized how we access language information, incorporating features impossible in print versions. From audio pronunciations to usage analytics, these products have transformed the linguistics industry. This trivia question explores an innovative feature that changed how dictionary products are developed and marketed to language enthusiasts, educators, and learners worldwide.

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User-contributed content allowing the public to submit new words and definitions
Etymological visualization tools mapping word origins through interactive timelines
AI-powered contextual examples showing words used in contemporary media
Cross-language comparison tools for multilingual vocabulary building