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]