Which dictionary brand was the first to introduce color-coded word families and visual thesaurus maps in its digital product to help language learners visualize semantic relationships?

The dictionary industry has seen remarkable innovation in recent decades, transforming traditional reference books into sophisticated digital tools. Major dictionary brands have developed unique features to differentiate themselves in this competitive landscape. This poll tests your knowledge of a significant product development milestone in the dictionary publishing world that changed how we interact with language learning tools.

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Oxford University Press with Oxford Advanced Learner's Dictionary
Merriam-Webster with Visual Dictionary Online
Longman with Active Study Dictionary
Thinkmap with Visual Thesaurus