Safety requirement.

The youth and their new words.........

It's based on Roman numerals, so not new. A couple of millennia old.

C=100 - centennial=100 years
M=1,000 - millennial=1,000 years
bi=2 - biennial=2 years
bi=½ - biannual=½ year (1 year x .5)

Don't get me started on that weirdo that came up with decade. Probably had a thing for Dewey.
 
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