known quantity

Bill Cosby was already a known quantity when The Cosby Show began in 1984.

Eight iterations in, Mario Kart has become something of a known quantity.

So when Vitter got into trouble, he was a known quantity who had shown himself to be politically formidable.

Getting hold of a known quantity is one thing, but—as evidenced by the results thus far—making it work is another.

But a negative that high is frightening for a known quantity.

She had an atomic weight upon which you could depend as upon any other known quantity.

The finely-divided substance containing the dioxide is digested in a solution of a known quantity of iron in sulphuric acid.

Her ideas were both contagious and epidemic, and she was always a known quantity in the place.

The materialist still makes use of the notion of eternity, and frequently handles it as though it were a perfectly known quantity.

A community like this is made up of the absolutely known quantity—of types repeating themselves through centuries.