sub ‧ sid ‧ i ‧ ar ‧ i ‧ ty /səbˌsɪdiˈærəti, səbˌsɪdiˈærɪti/ BrE AmE noun [uncountable]
a word meaning a political ↑ policy (1) in which power to make decisions is given to a smaller group – used especially about the European Union giving power to its member countries