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.
The adjective "biennial" means done or occurring every 2 years. (biannual means twice a year)
It is spelled right (biennial) and means something that happens every two years. Example- a flower blooming every two years.
The word "biennial" means an event that either lasts for two years, or it happens every two years.
Biennial or biannual can refer to something which happens every two 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.
Something which happens every second year is termed biennial
A triennial event happens every three years.
bicentennial means when something happens twice in a year, or once every two years
Something that happens every six years is sexennial.
Because each Olympics (summer or winter) happen every four years. These are alternated so that an Olympics happens every two years