Usage History of 'directivity'

The following chart shows how frequently 'directivity' appeared in printed materials over time. For example, the word 'directivity' occurred 2 times in books in 1883 and 8,032 times in 2008. From 1883 to 2008, the word 'directivity' was used a total of 205,052 times in books scanned by Google. See Reference: Google Ngram project.

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