con·trib·u·to·ry 
/kənˈtrɪbjəˌtori, Brit kənˈtrɪbjətri/ adjective
always used before a noun /kənˈtrɪbjəˌtori, Brit kənˈtrɪbjətri/ adjective 1 : helping to cause something
▪ Car exhaust is a major contributory factor in air pollution. [=car exhaust is a major cause of air pollution] 2 : paid for by both the employee and employer
▪ a contributory pension ▪ contributory insurance
▪ Car exhaust is a major contributory factor in air pollution. [=car exhaust is a major cause of air pollution]
▪ a contributory pension ▪ contributory insurance
