Sure. "The centralization of any network is a measure of how central its most central node is in relation to how central all the other nodes are." http://en.wikipedia.org/wiki/Centrality#Centralization
Or here, at the end of the sub-section: http://faculty.ucr.edu/~hanneman/nettex ... ml#Freeman
For instance, a high degree centralisation value thus indicates that a small number of nodes hold a large number of all ties in the network (thus have an extraordinarily high degree centrality, while the majority has a small degree centrality). A small score indicates that all ties are relatively equally distributed over all nodes. A star network has a graph centralisation value of 1, a circle network of 0.