The phrase "most semiyearly" can be substituted with a few different synonyms. Firstly, "biannual" means occurring twice a year, which is the same frequency as "most semiyearly." Alternatively, "biennial" means occurring once every two years, which is half the frequency of "most semiyearly." If the intention is to convey a slightly less frequent schedule, the phrase "semiannual" can be used, which means occurring twice a year but less frequently than "most semiyearly." "Semiyearly" can also be substituted with "semiannual" if the intention is to use a more commonly recognized word.