subgroup

Noun
  1. A distinct and often subordinate group within a group (synset 108017525)
    is a type of: group, grouping - any number of entities (members) considered as a unit
    subtypes: bench - the reserve players on a team
  2. (mathematics) a subset (that is not empty) of a mathematical group (synset 106026402)
    referred to in: math, mathematics, maths - a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement
    is a type of: group, mathematical group - a set that is closed, associative, has an identity element and every element has an inverse

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