Which major dictionary made history in 2015 by adding an emoji (😂) as its 'Word of the Year' for the first time?

Every year, dictionaries formally add new words that have gained widespread usage. This process represents a fascinating intersection of language evolution and product development in the linguistics industry. Dictionary publishers carefully research, validate, and ultimately 'launch' these new entries—effectively turning common usage into officially recognized vocabulary. Test your knowledge about this unique form of 'product launch' in the language industry!

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Oxford Dictionary
Merriam-Webster
Cambridge Dictionary
Collins Dictionary