Unilateral Contract

contract which places an obligation on only one side

Noun
1. a one-sided agreement whereby you promise to do (or refrain from doing) something in return for a performance (not a promise)
(hypernym) agreement, understanding

When the party to whom an engagement is made, makes no express agreement on his part, the contract is called uni-lateral, even in cases where the law attaches certain obligations to his acceptance. A loan of money, and a loan for use, are of this kind.
   

This entry contains material from Bouvier's Legal Dictionary, a work published in the 1850's.