con·trib·u·to·ry /kən-'tri-byə-ˌtōr-ē/ adj
1: characterized by or making contributions to a common fund or enterprise; specif: of, relating to, or being an employee benefit plan to which both employers and employees make contributions
2: helping to bring about an end or result
contributory infringement
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.