Subpensive condition

SUBPENSIVE CONDITION. One which prevents a contract from going into operation until it has been fulfilled; as if I promise to pay you one thousand dollars on condition that the ship Thomas Jefferson shall arrive from Havre, the contract is suspended until the arrival of the ship. 1 Bouv. Inst. n. 731.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.