Definition of "unification"

The route between Melbourne and Albury is one of the first scheduled, under the great Australian gauge unification scheme, for conversion to 4 ft. 8½ in., and this will permit through running between Melbourne, Sydney and Brisbane.

1946 March and April, “Notes and News: The "Spirit of Progress," Victorian Railways”, in Railway Magazine, page 119

On November 15 our Ministry of Foreign Affairs informed Soviet ambassador Petrov of this decision. At the same time I sent a message to President Harry S. Truman, pointing out that Soviet Russia's treaty violations and bad faith in Manchuria not only were detrimental to China's territorial integrity and unification, but also constituted a serious threat to peace and order in East Asia, and that the only way to prevent any further deterioration of the situation would be for China and the United States to take positive and coordinated actions.

1957, Chung-cheng (Kai-shek) Chiang, Soviet Russia in China: A Summing-up at Seventy‎, New York: Farrar, Straus and Cudahy, page 146

On the other hand, I must think of Korea and, particularly, of the three million enslaved Koreans in the North. My obligation as a leader of the Korean people is to achieve unification of our country by peaceful means if possible but by force if necessary.

1978, Richard Nixon, quoting Syngman Rhee, RN: the Memoirs of Richard Nixon‎, Grosset & Dunlap, page 127

5.7.T ( Unification theorem ) For any two terms or formulas without quantifiers X and Y, the following holds.(i) The unification algorithm UNIF1, applied to X, Y, terminates after a finite number of steps.(ii) {X, Y} is unifiable iff UNIF1 so indicates upon ter- mination. Moreover, the substitution σ then available as out- put is a most general unifier of {X, Y}.

1982, Wolfgang Bibel, Automated Theorem Proving, Braunschweig: Friedr. Vieweg & Sohn, page 94