Semiweekly is a word that describes something that happens twice a week. However, there are other synonyms that can be used to describe the same frequency of events. These include biweekly, which is commonly misunderstood to mean twice a week but actually means every two weeks, and fortnightly, which means occurring every two weeks. Another possible synonym is semi-monthly, which means happening twice a month. Other variations include twice-weekly, twice-a-week, and every-3.5-days. No matter which word you use, the frequency remains the same - something that happens twice a week, or every other day.