Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

usance
     n 1: the period of time permitted by commercial usage for the
          payment of a bill of exchange (especially a foreign bill
          of exchange)
     2: (economics) the utilization of economic goods to satisfy
        needs or in manufacturing; "the consumption of energy has
        increased steadily" [syn: {consumption}, {economic
        consumption}, {use}, {use of goods and services}]
     3: accepted or habitual practice [syn: {custom}, {usage}]