Lat. In Roman law, a contract for the hiring or letting of services, or for the performance of a certain work in consideration of the payment of a stipulated price. It is the same contract as “locatio operis,” but regarded from the standpoint of the one who is to do the work, and who is called “redemptor operis,” while the hirer is called “locator operis.” See Mackeld. Rom. Law, § 408.