a persons birthday on the day of a leap year
bidecadal
Every 200 years
Every 100 years is called a century, made up of 10 decades.
True.
The letter "Y."
it is a a centry
People born on a double leap year
Biennial (biannual is twice a yesr)
El Nino.
Eventual world climate change
Eventual world climate change
When used as an adjective, it means occurring every, or last for, four years. As a noun, it references an event that occurs every four years. (see: http://dictionary.reference.com/browse/quadrennially )
Biannual can be used in a sentence as an adjective to denote an event that occurs twice a year, or every two years. So, "It's a biannual event" is a rather ambiguous statement.
Every 4 years
The winter Olympics are a sporting event Witch occurs every 4 years. They were first held in 1924 in chamonix,france
2024
every two years