While it may seem logical to hyphenate biannual, the rules of hyphenation are simple: we should hyphenate root words with prefixes only to avoid word confusion. ... On the other hand, we would not hyphenate biannual, because the root word and prefix are easily understood without the hyphen.

Is it Biyearly or biannual?

Biyearly is a synonym of biannual (and biannually), which can also be used to mean every two years or twice per year. Biyearly can also mean “lasting for two years,” but this meaning is rarely used. Examples: The Olympic Games occur biyearly, meaning they happen every two years.

Is biannual one word or two?

Biannual is a combination of two English words; bi and annual. Biennial originated from early 17th century: from Latin biennis (from bi- 'twice' + annus 'year') + -al. Biannual as adjective: Biannual is used as an adjective in English language where it has only one meaning which is occurring twice a year.