Bi-annual Sentence Examples

You receive an invitation to a biannual event, but wait: Does that mean you’ll be invited again in six months, or will you have to wait two years? Or is that biennial? One of these words means one thing, and one the other, but which is it?

You have been invited to a biannual event, but then later you see it referred to as a semiannual event. What is the difference? Explore the meanings of biannual and semiannual and when to use both terms.