It is: 1 per cent of a year because 1/100 = 1%
100 Root of the word is Cent which means 100
Century, centennial, centenary
century centenary centennial
"Century", from the Latin centus meaning one hundred. The same root gives us the word "Centurion", an officer who commands 100 soldiers, and "cent", for one hundredth of a dollar.
About 3 cent. a year About 3 cent. a year About 3 cent. a year About 3 cent. a year
About 3 cent. a year About 3 cent. a year About 3 cent. a year About 3 cent. a year
Mil can be the old fashioned word for mille (a thousand) especially in dates L'an mil neuf cent = Mille neuf cent = the year 1900 or mil can be the millet (cereal)
Biannual means twice every year.
It means year or yearly for example anniversary this is a Latin root word.
Centenary means the 100th anniversay, which would be the 100th year.
year
While not specifically "by year", chronological means "in order of occurrence in time"