No. It will shorten the life of the wheel. Don't do it except in emergencies.
Just get a spoke that's the same length as all the others from the side of the hub the broken one is from, put it in, and tighten until the wheel runs approximately true with no rim wobble. That will be hundreds of times better than nothing even if you don't have a shop tension and true the wheel.
Several online sellers have them.
Thing is, the wheel may be poorly tensioned or it may be close to the end of its life if you got it used.
Last edited by garage sale GT; 09-22-11 at 07:28 PM.