suppletory

adjective

sup·​ple·​to·​ry sə-ˈplē-tə-rē  ˈsə-plə-ˌtȯr-ē 

: supplying deficiencies : supplementary

rules suppletory to the contract

Word History

Etymology

borrowed from New Latin supplētōrius, from Latin supplēre "to fill up, complete, raise to its full complement" + -tōrius, deverbal adjective suffix, originally forming derivatives from agent nouns ending in -tōr-, -tor — more at supply entry 2

First Known Use

circa 1631, in the meaning defined above