Arbitrage

Ar·bi·trage

Arbitrage

n.
  1. Judgment by an arbiter; authoritative determination. [Archaic]
  2. A traffic in bills of exchange (see Arbitration of Exchange). (Com.)
  3. the simultaneous or near simultaneous purchase and sale of the same or closely linked securities or commodities in different markets to make a profit on the (often small) differences in price. (Finance)