Is semi annual and biannual the same?

Related questions

1. What is once every 2 years called?
2. Is Onion a biennial?
3. What is a hardy biennial plant?
4. Can you grow onions all year round?
5. What is a Biennale exhibition?
6. How do you say every other year?
7. Is biannual every 2 years?
8. How long can perennials live?
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Tags

1. #means
2. #thing
3. #twice
4. #biannual
5. #whereas
6. #every
7. #words
8. #occurring
9. #semiannual
10. #years
11. #biennial
12. #these