An act the completion of which depends upon the will of the parties may be revoked, but if it depends upon the will of third parties or upon a contingency, it cannot be revoked.
Definition of Actus Inceptus Cujus Perfectio Pendet Ex Voluntate Partium Revocari Potest Si Autem Pendet Ex Voluntate Tertiae Personae Vel Ex Contingenti Revocari Non Potest
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Definitions from Black's Law Dictionary: 2nd Edition and Ballentine's Law Dictionary as are available for each term in each dictionary.
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Ballentine's Law Dictionary -
Black's Law Dictionary: 2nd EditionAn act already begun, the completion of which depends on the will of the parties, may be revoked; but if it depend on the will of a third person or on a contingency, it cannot be revoked. Bac. Max. reg. 20.