- A group within a larger group; a group whose members are some, but not all, of the members of a larger group.
- (grouptheory) A subset H of a group G that is itself a group and has the same binary operation as G.
- French: sous-groupe(fr)m
- German: Untergruppe
- Italian: sottogruppo(it)m
- Spanish: subgrupo(es)m
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