betrothal Copy link Outline 1. sponsālĭa, ium and iorum, n.2. pactio nuptiālis. Liv. • betrothal: 1. sponsālĭa, ium and iorum, n.: to perform the ceremony of b. in due form, sp. rite facere, Liv.; in the form of words dictated, verbis dictatis, Ov.: day of b., dies sponsaliorum, Suet. 2. pactio nuptiālis. Liv.