Tanya, is it because they generally happen periodically i.e. at regular intervals?

In a region where massacres of Hindus happen periodically, this attack was highly unusual.

This happened to her periodically, a legacy from her father and what he had done to her.

Since elections happen periodically, they limit citizen participation in politics to merely the selection of leaders and keep people away from policy formation.

I've been completely bedbound for the last week or so, this happens to me periodically.

We know more about ice ages that happen periodically.

The Army continues to keep these two investigative units separate, even though parallel investigations happen periodically.

This happens only periodically, and the tai chi always goes on.

"I had to accept that this was a thing that happens periodically."

"It's the usual way to fill a vacancy, and it happens periodically," he said.