Bimestrial is an adjective that refers to something that takes place every two months. It is very important to understand the concept of antonyms, which are words that have opposite meanings. Some of the antonyms for bimestrial are annual, biennial, daily, hourly, monthly, quarterly, and weekly. Annual means something that occurs once a year, while biennial means every two years. Daily refers to something that occurs every day, whereas hourly pertains to every hour. Monthly happens once a month, quarterly every three months, and weekly every seven days. It is essential to know the antonyms of a word since it gives a better understanding of its definition and usage.