- synallagmatic (adj.)
[synallagmatic 词源字典]
- "expressing reciprocal obligations," from Greek synallagmatikos, from synallagma "a covenant, contract," from syn- "together with" (see syn-) + allagma "thing taken in exchange," from stem of allassein "to exchange, barter," from allos "another" (see alias (adv.)). [synallagmatic etymology, synallagmatic origin, 英语词源]