Bi yearly.
Something that occurs TWICE a month is called SEMI monthly (semi=half) and something that occurs every TWO months is called BI-Monthly (BI=TWO)
"Bi-yearly" typically means occurring twice a year or every two years.
"bi" means two and "centi" means hundred and "anual" means year. so bi-centen-nial means "every two hundred years."
Biannual biannual means twice per year. Biennial means every two years or every other year.
It means twice a month. For example, we pay our water and electricity bills bi-monthly.
bi monthly is once every two months.
Biennial is a word describing an event that happens every two years.
"bi" is prefix meaning every other, but it can be any time period. For example: Biweekly = every other week bimonthly = every other month Biennially = every other year
Semi-Monthly means twice per month. Bi-weekly means every two weeks. A Semi-Monthly cycle occurs 24 times per year. A Bi-Weekly cycle occurs 26 times per year.
The word you are looking for is biennial. It does not mean a person who will have sex with anyone but only once every two years.
Bi-annual = twice a year Bi-ennial = every two years
Bicentennial means it has happened yearly for 200 years or once every 200 years. Bi- (dual, two) cent- (100, 1/100)