reciprocating

Etymology
See reciprocate § Etymology.

Adjective

 * 1) That moves back and forth or up and down.
 * 2)  That has one or more pistons that move back and forth or up and down.
 * 3)  Whose mechanism relies on a back and forth or up and down motion.
 * 4)  Responding in kind.

Translations

 * Greek:.
 * Manx: maylartagh, covuilltagh