See also: décolonisation English Etymology From de- + colonisation. Pronunciation (UK) IPA(key): /diːˌkɒlənaɪˈzeɪʃən/ Rhymes: -eɪʃən Noun decolonisation (countable and uncountable, plural decolonisations) Alternative spelling of decolonizationWikiwand - on Seamless Wikipedia browsing. On steroids.