Definitions for "Fermilab"
Fermi National Accelerator Laboratory, located in Batavia, IL, just 15 minutes from my home in Wheaton, IL. It's one of the leading particle accelerators in the world at the moment, and yet is really open and nice. There are no guards at the gate, most of its land is nice reconstructed prairie (complete with a bison herd!), and it's a nice place to go biking as well as work. Working as a student there was nice because it was so open - I could go anywhere and do anything I needed to without being hassled.
A laboratory, operated by the Department of Energy, located in Batavia, Illinois. It is the site of the machine that currently operates at the highest energy in the world, the Tevatron. For more information, see:
Fermi National Accelerator Laboratory- the largest laboratory in the US for studying particle physics. Fermilab advances the understanding of the fundamental nature of matter and energy by providing leadership and resources for qualified researchers to conduct basic research at the frontiers of high energy physics and related disciplines.