The Collaborative International Dictionary of English v.0.48:
centralisation \centralisation\ n. same as centralization. [WordNet 1.5]WordNet (r) 3.0 (2006):
centralisation n 1: the act of consolidating power under a central control [syn: centralization, centralisation] [ant: decentralisation, decentralization] 2: gathering to a center [syn: centralization, centralisation]