The term "biannual" can often be confused due to its similarity with other terms, but in the context of English vocabulary, "biannual" means "twice a year." This is crucial to understand, particularly when comparing it with similar terms such as "biennial," which means "once every two years." Given the options for the question about the meaning of "biannual," let's analyze them:
Therefore, the correct answer is: twice a year.
Pick out the words from the passage to make antonyms: