twice-yearly(occurring twice a year; также: twice yearly/biannually (can be: every 2 yrs and also twice a year); biyearly/bi-yearly (can be: every 2 yrs and also twice a year); half-yearly; semiannual Artjaazz)
Biannual(Biannual/biennial. ‘Biannual' means twice a year and ‘biennial' means every two years, but the terms are often confused. If the meaning is not clear from the context, use alternatives such as ‘twice-yearly' or ‘two-yearly' or clarify what you mean, e.g. ‘the biannual/biennial report (i.e. published every six months / two years)'. Mikhaliova)
