Bi-weekly versus Semi-weekly

What is the Difference Between Bi-Weekly and Semi-Weekly?

When to Use Bi-Weekly

Something that occurs bi-weekly occurs every other week, in other words, once every two weeks.

When to Use Semi-Weekly

Something that occurs semi-weekly, by contrast, occurs every half-week, or twice a week.

Summary

Is it bi-weekly or semi-weekly? Some writers use bi-weekly when they really mean semi-weekly, which has led to confusion because it happens so often.

Bi-weekly means every two weeks.
Semi-weekly means twice a week.