The only function he had left was to die and take an organization with him.

"Though there's no reason to believe that that's its only function."

The government's only functions are to maintain order and structure.

That is the only function of the state as we see it.

Finally, some languages have words whose only function is as a question tag.

He had treated her like a thing, whose only function in life was to serve him.

A room whose only function was to serve as a place to work.

Acting as guide was apparently not its only function, however.

You have two letters to deliver, and that's your only function.

We already have more than enough ways to hit countries with nuclear weapons, and that is its only real function.