1. Four-monthly
2. Triannual
3. Periodic
4. Semi-annual
5. Biannual
6. Semi-yearly
7. Tri-annually
8. Semestral
9. Tri-yearly
10. Quadrennial
11. Quaternary
12. Quinquennial
13. Quinquennially
14. Quadri-annual
15. Quadri-annually
16. Quaternally
17. Quadrennially
18. Quaterly
19. Quaternally
20. Quaternary
21. Quadrennial
22. Quadri-yearly
23. Quinquennially
24. Quinquennial
25. Quinquennium
26. Quater-yearly
27. Quaterly
28. Quaternary
29. Quaternate
30. Quater-annual

Finding the right synonym for a word can be a challenge, especially when it comes to uncommon words like “quarterly”. Luckily, there are many different options to choose from in order to get the desired meaning across. Whether you’re looking for a word to use in a business report or a creative writing piece, these 30 synonyms for “quarterly” are the best ideas for getting the job done. From “four-monthly” and “triannual” to “quaternary” and “quinquennial”, these words can provide the perfect alternative for any situation. Each of these words has a unique meaning and can be used to express the idea of something happening every three months. With these synonyms at your disposal, you can ensure that your writing is precise and accurate.