As a proper noun united
is (chiefly|british) any of many football teams formed by the amalgamation of smaller ones.
As a noun combination is
the act of combining, the state of being combined or the result of combining.
Joined into a single entity.
Involving the joint activity of multiple agents.
The act of combining, the state of being combined or the result of combining.
An object formed by combining.
A sequence of numbers or letters used to open a combination lock.
(mathematics) One or more elements selected from a set without regard to the order of selection.
An association or alliance of people for some common purpose.
(billiards) A combination shot; a billiard; a shot where the cue ball hits a ball that strikes another ball on the table.
motorcycle and sidecar
*(act of combining) fusion, merger
* (act of combining) division, separation
* (mathematics) permutation