contributory

/ˈkɒntɹɪˌbjuːt(ə)ɹi/

Etymology

From earlier contributary, from Middle English contributarie, from con- + tributarie after Middle French contributaire.

contributory means Of, pertaining to, or involving a contribution. Lexicurio rates it Rare gem — a strength score of 71 out of 100.

adj

Of, pertaining to, or involving a contribution.
Tending to contribute to a result.
Paying tribute, tributary.“My Lord the great Commander of the worlde, Besides fifteene contributory kings, Hath now in armes ten thouſand Ianiſaries, Mounted on luſty Mauritanian Steeds, […]”

A person or thing that contributes.“The response to firing is remarkable, and though the 280 lb. pressure seems more in the nature of a reserve for emergencies than a continuous working figure, even with the present-day apology for coal it seldom fell below 250 lb., and could always be brought up to blowing-off point with little difficulty. To this liveliness of steaming the thermic syphons are doubtless the chief contributory.”