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Semi-annual events occur twice a year.
Biannual events occur either every two years or twice a year.
To avoid confusion, use semi-annual rather than biannual or twice a year instead of biannually.
Biennial events occur every two years. Biennial can also refer to a two-year period (such as for a plan or budget).
In gardening, biennial plants have a two-year life cycle.
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