Subgroup
noun
1.
a subordinate group; a division of a group.
2.
Chemistry. a division of a group in the periodic table.
3.
Mathematics. a subset of a group that is closed under the group operation and in which every element has an inverse in the subset.
noun
1.
a distinct and often subordinate division of a group
2.
a mathematical group whose members are members of another group, both groups being subject to the same rule of combination
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