Semiweeklies are publications that come out twice a week. There are several synonyms for this word, such as biweekly, fortnightly, and semi-monthly. Biweekly refers to something that happens every two weeks, while fortnightly is used to describe something that happens every two weeks, especially a publication. Finally, semi-monthly refers to something that happens twice a month. All these words indicate the frequency of events or publications that happen twice in a specific period. The choice of which word to use depends on the context, but they all convey the same message of happening twice in a specific time frame.