It has been slowly evolving for at least six years.

Changes in security have been evolving slowly over the last decade.

In one way, your economic control evolves slowly into something else.

The stone would slowly evolve into the head of "Justice."

During this period they slowly evolved into their current appearance.

By then, the judiciary had slowly evolved into its modern form.

And, in the first weeks of the season, the bullpen has slowly evolved.

Man, at least, had been allowed to evolve slowly, over millions of years - and even that was too fast.

Now the big industries have gone but the village is slowly evolving.

Their plan evolved slowly, with few of its possibilities apparent at first.