2. : the purchase of the stock of a takeover target especially with a view to selling it profitably to the raider. arbitrage. The simultaneous purchase and sale of the same securities, commodities, or foreign exchange in different markets to profit from unequal prices.Arbitrage is the simultaneous buying of a product in one market and sale of the same product in a different market. From: Oil Trading Manual, 2002. Arbitrage is the simultaneous purchase and sale of the same asset in different markets in order to profit from a difference in its price. The simultaneous purchase and sale of equivalent assets or of the same asset in multiple markets in order to exploit a temporary discrepancy in prices. We want to get into the rental arbitrage business in North Carolina through an LLC. So we will be taking a long term. Here, you'll find general definitions of frequently used terms related to New England's wholesale electricity markets and power system.