de‧mil‧i‧ta‧rize (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 /diːˌmɪlətəraɪˈzeɪʃən, diːˌmɪlɪtəraɪˈzeɪʃən $ -rə-/ noun [uncountable]

[TahlilGaran] Dictionary of Contemporary English ▲