Which famous dictionary product made headlines in 2020 when it changed its primary definition of the word 'they' to include its use as a singular non-binary pronoun?

In the world of language and linguistics, dictionaries serve as fundamental products that shape how we understand and use words. Major dictionary publishers occasionally make headlines with significant product launches that reflect evolving language trends. This poll tests your knowledge about a groundbreaking dictionary product launch that sparked considerable debate in linguistic circles and mainstream media alike.

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Merriam-Webster's Dictionary
Oxford English Dictionary
Cambridge Dictionary
Collins English Dictionary