Usage History of 'retard'

The following chart shows how frequently 'retard' appeared in printed materials over time. For example, the word 'retard' occurred 2 times in books in 1563 and 52,251 times in 2008. From 1563 to 2008, the word 'retard' was used a total of 1,693,773 times in books scanned by Google. See Reference: Google Ngram project.

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