From The Collaborative International Dictionary of English v.0.48 :
Decentralize \De*cen"tral*ize\, v. t. to make less central; to prevent from centralizing; to cause to withdraw from the center or place of concentration; to divide and distribute (what has been united or concentrated); -- esp. said of authority, or the administration of public affairs. [1913 Webster]From WordNet (r) 3.0 (2006) :
decentralize v 1: make less central; "After the revolution, food distribution was decentralized" [syn: decentralize, deconcentrate, decentralise] [ant: centralise, centralize, concentrate]