Usage History of 'challenges'

The following chart shows how frequently 'challenges' appeared in printed materials over time. For example, the word 'challenges' occurred 4 times in books in 1579 and 1,279,422 times in 2008. From 1579 to 2008, the word 'challenges' was used a total of 15,822,362 times in books scanned by Google. See Reference: Google Ngram project.

See also:

Find all anagrams of 'challenges'
Words starting with a,b,c...
Words ending with a,b,c...
Words starting & ending with a,b,c....