Centennial means 100. If it is an anniversary, then 100 years. Remember that there are 100 cents (commonly called pennies) in one dollar.
200. Bi- means two, centennial means centuries (100 years).
The US's Centennial celebration in 1876 had 167 buildings. Within these were 30,000 exhibits.
A centennial refers to the 100th year, so it itself is only one year. If it was 100 years since the birth of someone or some historical event, this year would be regarded as the centennial year. A century refers to a complete set of 100 years.
Thirty -seven nations erected exhibits at the 1876 US Centennial celebration. The most impressive ones were the pavilions built by the UK, Germany, Austria and France.
A jubilee is simply a celebration normally on the anniversary of an event. You can have a jubilee any year though they are often associated with significant ones such as 25, 30, 40, 50, 60 years etc
March 31, 2017 (Transfer Day) will be the actual celebration, but some Centennial Commemoration events happened in 2015, and many events continue through December 2017.
A 70 th Anniversary is special- and sadly this may be the last celebration for many of the D-Day veterans
There is no such word as "centenial". However, a CENTENNIAL is a celebration of the 100th anniversary of a person's birth or the establishment of a museum, company, or other organization. There are many on-line and print dictionaries that will help you find word origins and definitions much more quickly than waiting for a response on a query site.
A platinum wedding anniversary is 70 years of marriage
25 years
25 years