Black's Law Dictionary (2nd edition)dictionaries

Usance

In mercantile law. The com-mon perlod fixed by the usage or custom or habit of deallng between the country where a blll is drawn, and that where it is payable, for the payment of bills of exchange. It means, In some countries, a month, in others two or more months, and in others half a month. Story, Bllls, M 50, 144, 332

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