The Collaborative International Dictionary of English v.0.48:
decolonization \decolonization\ n. 1. the action of changing from colonial to independent status. Syn: decolonisation. [WordNet 1.5]WordNet (r) 3.0 (2006):
decolonization n 1: the action of changing from colonial to independent status [syn: decolonization, decolonisation]