It also helped explain the radical shifts in national politics which occurred irregularly in American history.

Heavy menstruation that occurs frequently and irregularly is menometrorrhagia.

This variation includes a special characteristic which is "the Judgement", that occurs irregularly, decided by the Judge.

El Niños usually occur irregularly, approximately every two to seven years.

It occurred irregularly, generally when some reason arose.

Releases occur irregularly according to the progress of the Linux kernel and open source programs.

But in the past, fires occurred irregularly when lightning would do the job.

In Britain it is an immigrant that occurs irregularly.

These changes could occur irregularly in different parts of the world.

Dystonic tremors occur irregularly and often can be relieved by complete rest.