/ kənˈtrɪbjətəri; NAmE -tɔːri/ adjective [ usually before noun ]
1.
helping to cause sth :
Alcohol is a contributory factor in 10% of all road accidents.
2.
involving payments from the people who will benefit :
a contributory pension scheme / plan (= paid for by both employers and employees)
OPP non-contributory
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WORD ORIGIN
late Middle English (in the sense contributing to a fund ): from medieval Latin contributorius , from Latin contribut- added, from the verb contribuere , from con- with + tribuere bestow.