combination

combination is a Noun

Definition:

[1] The act or process of combining or uniting persons and things. Making new compounds by new combinations. Boyle. A solemn combination shall be made Of our dear souls. Shak.

[2] The result of combining or uniting; union of persons or things; esp. a union or alliance of persons or states to effect some purpose; -- usually in a bad sense. A combination of the most powerful men in Rome who had conspired my ruin. Melmoth.

[3] The act or process of uniting by chemical affinity, by which substances unite with each other in definite proportions by weight to form distinct compounds.

[4] The different arrangements of a number of objects, as letters, into groups.