IPA: /ˌæntɪˈkoʊniəl/
KK: /æntiˈkoʊniəl/
Opposed to or resisting colonial rule and influence.
The country's leaders adopted an anticolonial stance to fight against foreign domination.
Anticolonial is formed from "anti-" (meaning against) and "colonial" (from Latin "colonia", meaning a settlement or colony). The term describes a stance or movement that opposes colonialism and the control of one nation over another.
Think of being 'against' ('anti-') the idea of 'colonies' ('colonial') — that's why anticolonial means opposing colonial rule.