relinquishment

US /rɪˈlɪŋ.kwɪʃ.mənt/
UK /rɪˈlɪŋ.kwɪʃ.mənt/
1.

afstand doen

the act of giving up something such as a responsibility, claim, or possession:

:
How do you negotiate the relinquishment of native title rights when you do not know what they are?