subset
n. countable B2 Upper Intermediate US //ˈsəbˌsɛt// UK //sˈʌbsɛt// sub·set
n. a smaller group of people or things that is part of a larger group. You use this when you want to focus on just one specific section of a whole set.
n. a portion of a larger group or set, where every element of the smaller group is also contained within the larger one.
This data represents a small subset of the total population.
The researchers focused on a subset of patients who had not responded to previous treatments.
In mathematical set theory, a set is considered a subset of another if all its members are also members of the parent set, including the possibility that the two sets are identical.
From sub- + set.
Usage
Often followed by the preposition 'of' to identify the parent group.