Bi-monthly refers to something that occurs every two months or twice a month. Some synonyms for bi-monthly include "semi-monthly," which refers to something occurring twice a month, and "bimonthly," which means the same as bi-monthly. Other synonyms for bi-monthly include "fortnightly," which refers to something occurring every two weeks, and "biennially," which means something occurring every two years. It is essential to understand the difference between the meanings of these words to use them correctly in sentences. Using the right synonym can make your writing more precise and enhance your communication skills.