Usage History of 'vocalization'

The following chart shows how frequently 'vocalization' appeared in printed materials over time. For example, the word 'vocalization' occurred 2 times in books in 1770 and 13,403 times in 2008. From 1770 to 2008, the word 'vocalization' was used a total of 455,535 times in books scanned by Google. See Reference: Google Ngram project.

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