A century is a way to describe a length of time. One century is one hundred years. The ancient Romans used the word centuria to describe a group of about one hundred soldiers, organized into a single unit.

The Roman numeral for 100 is "C". The word for 100 in Latin is "centum".

A centenary is a celebration of something that happened 100 years ago. A bicentenary celebrates 200 years, a tercentenary 300 years.

A centenarian is someone who is 100 years old or more.

Centennial means something that happens every 100 years, or that lasts 100 years.

More information Millennium, Before Christ / Before Common Era (BC/BCE) ...
MillenniumCentury
Before Christ / Before Common Era (BC/BCE)
4th: 40th 39th 38th 37th 36th 35th 34th 33rd 32nd 31st
3rd: 30th 29th 28th 27th 26th 25th 24th 23rd 22nd 21st
2nd: 20th 19th 18th 17th 16th 15th 14th 13th 12th 11th
1st: 10th   9th   8th   7th   6th   5th   4th   3rd   2nd   1st
Anno Domini / Common Era (AD/CE)
1st:   1st   2nd   3rd   4th   5th   6th   7th   8th   9th 10th
2nd: 11th 12th 13th 14th 15th 16th 17th 18th 19th 20th
3rd: 21st 22nd 23rd 24th 25th 26th 27th 28th 29th 30th
4th: 31st
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