Usage History of 'parfocality'

The following chart shows how frequently 'parfocality' appeared in printed materials over time. For example, the word 'parfocality' occurred 2 times in books in 1940 and 26 times in 2008. From 1940 to 2008, the word 'parfocality' was used a total of 589 times in books scanned by Google. See Reference: Google Ngram project.

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