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Something that happens once a century.
Something that happens every six years is sexennial.
Something that happens every 100 years is called a centennial. It marks a significant milestone or anniversary reaching the 100-year mark.
Biennial or biannual can refer to something which happens every two years.
A leap year happens only once every four years; that is also true of US Presidential elections.
The Olympics is an event that happens once every 4 years, bringing together athletes from around the world to compete in various sports.
bicentennial means when something happens twice in a year, or once every two years
a leap year
Some things that happen once every four years include: - Leap Years - US Elections - The Olympics
twice-a-day or it can be called semi-diurnal which relates to such occurrences as tides.
A millennium happens once every thousand years.
THAT YOUR AGE ON THIS DAY IS2022