In linguistics, the postessive case (abbreviated POSTE) is a noun case that indicates position behind something.
This case is found in Northeast Caucasian languages like Lezgian and Agul. In Lezgian the suffix -хъ (-qh), when added to the ergative-case noun, marks the postessive case. This case is now rarely used for its original meaning "behind" and is often used to mean "with"[1] or "in exchange for".[2]
the Postessive is the case of arguments of certain verbs and of the postposition galaz 'with'
A very specific meaning of the Postessive is 'in exchange for'.