Definitions of proportionality

(EU LAW) the principle that a decision taken by the EU should not go beyond what is necessary to achieve an objective (especially one set out in the Treaty of Rome)

The proposed legislation lacks proportionality under the Treaty of Rome

(INTERNATIONAL LAW) the idea that harm caused to civilians or civilian property must not be too great in relation to the advantage to be gained by a military attack

There must be an investigation into the proportionality of the response by the United Front.

the idea that government action should be proportional to the ends achieved by that action

The raising of interest rates to 15% to curb inflation showed a complete lack of proportionality.