n. 惯例, 习惯, 使用, 利息

[经] 惯例付款期

Usance \Us"ance\, n. [F. See {Use}, v. t.]
1. Use; usage; employment. [Obs.] --Spenser.

2. Custom; practice; usage. [Obs.] --Gower. Chaucer.

3. Interest paid for money; usury. [Obs.] --Shak.

4. (Com.) The time, fixed variously by the usage between
different countries, when a bill of exchange is payable;
as, a bill drawn on London at one usance, or at double
usance.