de ‧ mil ‧ i ‧ ta ‧ rize BrE AmE ( also demilitarise British English ) /ˌdiːˈmɪlətəraɪz, ˌdiːˈmɪlɪtəraɪz/ verb [transitive usually passive]
to remove the weapons, soldiers etc from a country or area so that there can be no fighting there:
the demilitarized zone between the two countries
—demilitarization /diːˌmɪlətəraɪˈzeɪʃ ə n, diːˌmɪlɪtəraɪˈzeɪʃ ə n $ -rə-/ noun [uncountable]