Still, no one had a clear definition of what Web 2.0 actually meant.

There is no clear definition of what it means to "speak a language".

In addition there is no clear definition of what "one language" means.

While trying to find a clear definition, I ran across this.

In Canada, there is no clear definition at national level.

"It will give us a chance to get some clear definition of the campaign," he said.

I still can't get a clear definition on the true meaning of it all.

And I can't find a clear definition of that, can you?

It is particularly important for us to have a clear definition of political responsibility.

He had given her no clear definition of his job.