synallagmatic

adjective

syn·​al·​lag·​mat·​ic

ˌsi-nə-ˌlag-ˈma-tik, sə-ˌna-ləg-

in the civil law of Louisiana : bilateral

Word History

Etymology

Greek synallagmatikos of a contract, from synallagmat-, synallagama contract, covenant, from synallassein to enter into a contract, from syn- together with, at the same time as + allassein to change, exchange, barter, from allos other