When we describe something as biannual, we can mean either that it occurs twice a year or that it occurs once every two years. ... Some people prefer to use semiannual to refer to something that occurs twice a year, reserving biannual for things that occur once every two years.

Is bi yearly every 6 months?

Biannual simply meaning twice a year. Semiannual means every six months since the prefix semi means every half year.

Is there a word for every 2 years?

occurring twice a year; semiannual. occurring every two years; biennial.