- a set whose members are members of another set; a set contained within another set
- (Wikipedia, 2009) ⇒ http://en.wikipedia.org/wiki/Subset
- In mathematics, especially in set theory, a set A is a subset of a set B if A is "contained" inside B. Notice that A and B may coincide. The relationship of one set being a subset of another is called inclusion.
- Of a given set, a set all the elements of which are in the given set; A group of things or people, all of which are in a specified larger group