I think a reasonable reader can figure out from context what “data center” means. If you have a bunch of computers in a home or office you might call it a rack,

I think a reasonable reader can figure out from context what “data center” means. If you have a bunch of computers in a home or office you might call it a rack, or a network closet, maybe a server room. Most people won’t call it a data center. If you complain that the definition of “data center” is inexact, you’re missing the point—the definition of “edge” is inexact, too. That’s okay. People have a good enough definition of “data center” that it doesn’t need to be explained here. And people also understand that given definitions are not perfectly precise—there are exceptions and unusual cases.