Usage History of 'intrusion'

The following chart shows how frequently 'intrusion' appeared in printed materials over time. For example, the word 'intrusion' occurred 2 times in books in 1572 and 181,837 times in 2008. From 1572 to 2008, the word 'intrusion' was used a total of 4,249,887 times in books scanned by Google. See Reference: Google Ngram project.

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