Most half-yearly is a phrase that typically means occurring twice a year or every six months. However, there are various synonyms for this phrase that can be used depending on the context. For example, the term biannual can be used to describe something that happens twice a year, while the word semiannual is also commonly used. Another synonym for most half-yearly is biennial, which means occurring every two years. Additionally, the phrase biennale can be used to describe an event that happens every two years, such as an art exhibit or a cultural festival. In sum, there are several synonyms for most half-yearly that can be used depending on the specific situation.