IPA: //baɪˈjɪrli//
KK: /bɪˈjɪrli/
Occurring two times a year or every two years, depending on the context.
The biyearly conference attracts participants from all over the world.
Happening every two years or twice a year.
The conference is held biyearly, attracting participants from around the world.
Biyearly → It is formed from "bi-" (meaning two) and "year" (from Old English "geare", meaning a period of twelve months) and the suffix "-ly" (meaning in a manner of). The word "biyearly" means occurring twice a year or in a manner related to two years.
Think of 'bi-' meaning two and 'year' referring to a period of twelve months — this helps you remember that biyearly means something that happens twice a year.