A triennial event happens every three years.
Something that happens every six years is sexennial.
Something that happens every three years is a triennialevent.
Biennial or biannual can refer to something which happens every two years.
Semicentennial
the world cup ( I think) happens every 3 years or 4 years?
Your mom happens every two years. U.S. Senators are elected to serve terms of 6 years and terms are staggered so that about 1/3 of the Senate seats are up for election every two years.
A triennial event happens every three years.
Something that happens every six years is sexennial.
Something that happens every three years is a triennialevent.
Oh, dude, you mean besides my existential crisis? Ha, just kidding. The Olympics happen every 4 years, so I guess you're looking for something that happens more often. How about the World Choir Games? They happen every 2-3 years, so there you go, a fun fact for your next trivia night.
Something that happens once a century.
not a total eclipse, a partial eclipse occurs.
As far as I know, nothing special happens every 100,000 years. A full precession cycle takes about 26,000 years.
Quinquennial = something that happens every 5 years. Lustral = also something that happens every 5 years or we could invent: semi-Decennial: where semi is half and Deccennial happens every 10 years.
It happens every 200 years.
The Olympics.