Definition:Disjoint Sets

Definition
Two sets $S$ and $T$ are disjoint :
 * $S \cap T = \O$

That is, disjoint sets are such that their intersection is the empty set -- they have no elements in common.

Also known as
Some early sources refer to disjoint sets as non-overlapping or non-intersecting.

The term mutually exclusive sets can also be seen.

Also see

 * Definition:Pairwise Disjoint