Entry 2 senses · 2 variants Webster, 1913 decolonize · IPA /diːˈkɒlənaɪz/ v. t. v. i. 01 v. t. to grant independence to (a former colony). 1. to grant independence to (a former colony). 02 v. i. to release one's colonies and free them to become independednt nations; -- of nations. 1. to release one's colonies and free them to become independednt nations; -- of nations.