Definitions of surrender:

• noun:   the delivery of a principal into lawful custody
• noun:   acceptance of despair
• noun:   the act of surrendering (under agreed conditions)
• noun:   a verbal act of admitting defeat
• verb:   relinquish possession or control over

  Example: "The squatters had to surrender the building after the police moved in"

• verb:   give up or agree to forego to the power or possession of another

  Example: "The last Taleban fighters finally surrendered"

• verb:   relinquish to the power of another; yield to the control of another