Which dictionary's marketing campaign first used the famous tagline 'You don't have to be a college graduate to use it' to democratize dictionary use?

In the world of language and linguistics, dictionaries have been transformed from academic references into commercial products with strategic marketing campaigns. One dictionary in particular revolutionized the industry with its innovative marketing approach and distinctive tagline that emphasized accessibility for everyday users. Test your knowledge of this pivotal moment in linguistic product history!

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Merriam-Webster's Collegiate Dictionary
Webster's New World Dictionary
Oxford English Dictionary
American Heritage Dictionary