WordNet sense 1 (acceptance of despair):

resignation

WordNet sense 2 (a verbal act of admitting defeat):

yielding, giving up

WordNet sense 3 (relinquish possession or control over):

cede, deliver, give up

WordNet sense 4 (relinquish to the power of another; yield to the control of another):

relinquish

WordNet sense 5 (the act of surrendering (under agreed conditions)):

capitulation, fall