Which major dictionary brand was the first to introduce a 'Word of the Day' feature in its mobile app that allowed users to create personal vocabulary lists with pronunciation audio?

The digital transformation of language resources has dramatically changed how we interact with dictionaries and language learning tools. Major dictionary publishers have evolved their brand strategies to adapt to the digital age, with some traditional names becoming powerful apps while new players emerged. This trivia question explores how one major dictionary brand strategically positioned itself in the mobile app market to appeal to modern language learners.

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Oxford Dictionary (Oxford University Press)
Merriam-Webster
Cambridge Dictionary
Dictionary.com (IAC)