In commerce, the term applies to a combination of companies which decides that the best interests of each will be served by a merging of interests. This usually takes the form of the creation of a monopoly. The term is in wider use within the U.S.A., where the companies concerned are subject to the anti-trust laws. In the law of equity trust has a very specialized meaning which has been adapted commercially in the creation of investment trusts and unit trusts, common in both the U.K. and the U.S.A.

Reference: The Penguin Business Dictionary, 3rd edt.