happening *
occurrence *
occurrent
natural event

This is one of the first times that a natural event helped to trigger a civil war.

It is a natural event, like so many others that we ignore until they happen to us.

He's like a natural event with no known resolution in sight.

The menopause is a natural event in every woman's life.

This might be by parental design or due to natural events.

Major recovery works have been undertaken in response to all these natural events.

Both developments could be within the range of natural events.

"We need to know if it was a natural event," Gold said.

Just how natural events might explain this episode is difficult to imagine.

To some God or other they could attribute every natural event.