1) Party 2) Property transferor 
• (n.) An assigner; a person who assigns or transfers an interest; as, the assignor of a debt or other chose in action.
Is a person that transfers rights and interests of a property. 
As`sign·or' noun [ Latin assignator . Confer Assigner .] (Law) An assigner; a person who assigns or transfers an interest; as, the assignor of a debt or other chose in action. 
A person who assigns an asset or right to another... <a target=_blank href='http://www.finance-glossary.com/terms/assignor.htm?id=79&ginPtrCode=00000&PopupMode=false' title='Read full definition of assignor'>more</a>
A person or entity who has made an assignment of rights or property.
[n] - (law) the party who makes an assignment
noun (law) the party who makes an assignment