Black's Law Dictionary (2nd edition)dictionaries

Matrimonium

Lat. In Roman law. A legal marriage, contracted in strict ac--cordance with the forms of the older Roman law, i. e., either with the farreum, the coemptio, or by usus. This was allowed only to Roman citizens and to those neighboring peoples to whom the right of connubium had been conceded. The effect of such a marriage was to bring the wife Into the manus, ■or marital power, of the husband, and to ■create the patria potestas over the children

Source: Black's Law Dictionary 2nd Ed (1910)