sponsalia

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
SPONSALIA, or STIPULATIO SPONSALITIA. A promise lawfully made between 
persons capable of marrying each other, that at some future time they will 
marry. See Espousals; Ersk. Inst. B. 1, t. 6, n. 3. 
    

[email protected]