Which dictionary brand first launched a digital 'Word of the Day' subscription service in the 1990s that became a pioneering example of content marketing in the language product industry?

The world of dictionaries represents a fascinating intersection of language, publishing, and retail innovation. Beyond being reference materials, dictionaries have evolved into powerful brand products with unique marketing strategies and technological transformations. This trivia question explores how a famous dictionary brand revolutionized the language reference market through innovative retail techniques and product development.

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Merriam-Webster
Oxford University Press
Collins Dictionary
American Heritage Dictionary