As a result, I've been cooking up my own definition. In our inherently flawed world, such a society cannot exist. Therefore, we must remove ourselves as theoretical inhabitants of a utopia. Consider ourselves as Observers of the ideal society. We, the Observers, can see the various examples of "utopian perfection": technological achievement, social, economic, and political equality, liberty, and cultural knowledge. There must exist, however, an entity through which the Observers examine these perfections; this entity is the Metropolis. Think not of the Metropolis as a city, but as a being; it lives, breathes, and self-sustains. The Metropolis is also an ecological utopia- that is, the metropolis establishes a direct communication with its environment; that, or through its self-sustainability, it creates its own natural environment. Therefore, the environment informs the metropolis and vice versa.
Well, that's what's been bouncing around in my head for the entire weekend. This is only a small part of my musings and of what I wish to achieve with this idea. This archinerd's got more thinking to do.