What do you call every 4 months in a year?

Related questions

1. Is semi annual and biannual the same?
2. Do perennials live forever?
3. Is the Venice Biennale every year?
4. Can you grow onions all year round?
5. Is biannual every 2 years?
6. Is Onion a biennial?
7. Is biweekly every 2 weeks or twice a week?
8. How do you say every other year?
9. What is something that happens every 2 years?
10. Do onions spread?

Tags

1. #ambiguous
2. #triannual
3. #three
4. #triennial
5. #times
6. #avoid
7. #every
8. #years
9. #better
10. #between
11. #substitute
12. #often
13. #months
14. #phrase
15. #confusion