open city noun2 •A city which has announced (during wartime) that it has abandoned all defensive efforts, generally in the event of its imminent capture.“You needn’t worry about bombs, by the way. Dresden is an open city. It is undefended, and contains no war industries or troop concentrations of any importance.” — 1969 •A city that (during peacetime) is not heavily restricted regarding ingress and egress because it does not contain militarily sensitive facilities or extensive defense industrial plant. formsopen cities
