Which dictionary product launch marked the first time a major traditional dictionary publisher officially discontinued their print edition to focus exclusively on digital formats?

The dictionary market underwent a dramatic transformation in the digital age, with traditional publishers having to adapt quickly to new technologies. This poll explores a pivotal moment in dictionary product development history that changed how we access language resources forever. Test your knowledge about how language reference tools evolved from heavy tomes to instant digital solutions!

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Merriam-Webster's Collegiate Dictionary (2012)
Oxford English Dictionary (2010)
American Heritage Dictionary (2014)
Cambridge Advanced Learner's Dictionary (2011)