Definition: Disjoint Sets
Two sets are called disjoint if their intersection is empty. The Venn diagram (named after John Venn (18341923)), below illustrates two disjoint sets $A$ and $B:$
Examples
 The set of all mammals and the set of all reptiles are disjoint.
 The set of all mammals and the set of all reptiles are disjoint.
Mentioned in:
Definitions: 1
Solutions: 2
Thank you to the contributors under CC BYSA 4.0!
 Github:

References
Bibliography
 Reinhardt F., Soeder H.: "dtvAtlas zur Mathematik", Deutsche Taschenbuch Verlag, 1994, 10th Edition
 Kohar, Richard: "Basic Discrete Mathematics, Logic, Set Theory & Probability", World Scientific, 2016