Which groundbreaking product development feature did Merriam-Webster introduce in 2019 that revolutionized how dictionaries track language evolution?

The dictionary industry has undergone significant digital transformation in recent years. Traditional publishers have had to adapt their product development strategies to compete with new online resources and AI-powered language tools. This poll tests your knowledge of how one major dictionary brand innovated to maintain relevance in the digital age, changing not just their delivery method but fundamentally rethinking what a dictionary could be.

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Time Travel feature showing a word's complete definition history across centuries
Real-time corpus monitoring that adds new words based on usage frequency thresholds rather than editorial decisions
Personalized dictionary that adapts to individual reading level and vocabulary needs
Crowdsourced definition verification system allowing users to vote on meaning accuracy