Usage History of 'propulsions'

The following chart shows how frequently 'propulsions' appeared in printed materials over time. For example, the word 'propulsions' occurred 2 times in books in 1750 and 273 times in 2008. From 1750 to 2008, the word 'propulsions' was used a total of 7,677 times in books scanned by Google. See Reference: Google Ngram project.

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