Usage History of 'opening'

The following chart shows how frequently 'opening' appeared in printed materials over time. For example, the word 'opening' occurred 4 times in books in 1505 and 2,226,373 times in 2008. From 1505 to 2008, the word 'opening' was used a total of 52,283,146 times in books scanned by Google. See Reference: Google Ngram project.

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