1buying something such as a raw material or currency in one place and selling it immediately in another, in order to make a profit from price differences between the two places
Analysts attributed the activity to arbitrage buying: traders bought cocoa in New York to sell at a profit in London.
2buying and selling shares of two companies involved, or that may be involved, in a takeover, in order to make a profit from differences in the share values of the two companies
The company incurred losses in risk arbitrage - or takeover-stock speculation - arising from last year’s slump in U.S. merger activity.