This must have occurred gradually, through a great many generations.

Its benefits occur gradually, over months, and cannot be rushed.

Beyond all this, it gradually occurred to me we were making a third journey, through Mother's memory.

But it was thought that the connection between the two seas occurred gradually.

Most often liver failure occurs gradually and over many years.

It occurred gradually between the late 18th century and the early 20th century.

The process occurs gradually, especially for larger pieces of glass.

Within these new events change can occur gradually or quickly.

From television and concerts, their move into theater occurred gradually.

More often, improvement occurs gradually over a period of weeks or months.