A parley was a discussion between two warring parties regarding a possible cessation of hostilities.
In 2268, Captain James T. Kirk asked Commander Spock whether a truce or a parley between them and the Yangs were possible. (TOS: "The Omega Glory")
In 2381, Commander Jack Ransom demanded a parley with the Dulainians, who were about to sacrifice Lieutenant Commander Andy Billups and Ensign Sam Rutherford to their volcano god Morgo. (LD: "The Least Dangerous Game")