Which dictionary launch revolutionized language product marketing by being the first to be heavily advertised directly to consumers rather than just educational institutions?

In the world of language and linguistics, dictionaries represent some of the most significant product launches in history. These reference tools have transformed how we understand language and have become powerful branding opportunities for publishers. This trivia question explores a pivotal moment in dictionary marketing that changed how reference materials were positioned and sold to the public.

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Webster's Third New International Dictionary (1961)
The American Heritage Dictionary (1969)
The Random House Dictionary (1966)
The Oxford English Dictionary Compact Edition (1971)