What groundbreaking innovation did Noah Webster introduce in his 1828 American Dictionary that differentiated it from British dictionaries and established the foundation for Merriam-Webster's success?

The dictionary is perhaps the most essential product in the world of linguistics, with various brands competing for authority in language documentation. Among these, Merriam-Webster stands as one of the most recognized names in English lexicography. This poll tests your knowledge about a pivotal product innovation moment in the history of this linguistic giant that changed how dictionaries were created and used in America.

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The standardization of uniquely American spellings (like 'color' instead of 'colour' and 'center' instead of 'centre')
The inclusion of pronunciation guides using the International Phonetic Alphabet
The addition of etymologies tracing words back to their Proto-Indo-European roots
The integration of illustrations alongside definitions for visual learning