a persons birthday on the day of a leap year
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bidecadal
Every 200 years
Every 100 years is called a century, made up of 10 decades.
True.
The letter "Y."
An event that occurs once every three years.
it is a a centry
People born on a double leap year
Biennial (biannual is twice a yesr)
Events that occur every 5 years are often referred to as quinquennial events. Another term that can be used is quinquennium, which refers to a period of five years. These terms are commonly used in various fields such as academia, government, and business to describe events or milestones that happen on a five-year cycle.
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
An example of an occasional climate event that occurs every 3-8 years is the El Niño Southern Oscillation (ENSO). It is a climate pattern that involves the periodic warming of sea surface temperatures in the central and eastern tropical Pacific Ocean, leading to significant impacts on weather patterns worldwide.