The prefix added to Colonialism to mean 'after the period of Colonialism' is post-. Post-colonialism encompasses changes and legacies post-colonial rule.
The prefix that would be added to the noun Colonialism to make the word meaning "after the period of Colonialism" is post-. Post-colonialism refers to the time period and processes of change after the end of colonialism in a specific area. It can also indicate a concept that goes beyond traditional colonialism to capture its residue in academic and public discourses, signaling a focus on the effects and legacies of colonialism.
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