biannual

1 ENTRIES FOUND:
biannual /baɪˈænjəwəl/ adjective
biannual
/baɪˈænjəwəl/
adjective
Britannica Dictionary definition of BIANNUAL
always used before a noun
1 
: happening twice a year : semiannual
2 
: happening every two years : biennial

— biannually

adverb