rə̇ˈtərnəbəl, -tə̄n-, -təin- adjective
Etymology: Middle English retournable, retornable, from retournen, retornen to return + -able — more at return
1. : legally required to be returned, delivered, or argued at a specified time or place
a writ returnable at the next court session
a verdict returnable to the court
an interlocutory matter returnable on the date indicated
2.
a. : capable of being returned (as for reuse)
returnable bottles
b. : permitted to be returned
returnable fees
a returnable deposit
the merchandise is not returnable
3. : able to return
a source of … short-term power could make the military glider a returnable weapon — G.E.Pendray