amalgamation (amalgam ash on)

[ 2. The mixing or blending of different things, especially of races; the result of such mixing or blending; interfusion, as of diverse elements. Early in the fourteenth century the amalgamation of the races was all but complete. Macaulay , Hist. Eng., i. 3. Consolidation; specifically, the union of two or more incorporated societies or joint-stock companies into one concern or under one general direction.