A set whose members are members of another set; a set contained within another set.

Roget 75: class, division, category, categorema^†, head, order, section; department, subdepartment, province, domain.    kind, sort, genus, species, variety, family, order, kingdom, race, tribe, caste, sept, clan, breed, type, subtype, kit, sect, set, subset; assortment; feather, kidney; suit; range; gender, sex, kin.    manner, description, denomination, designation, rubric, character, stamp predicament; indication, particularization, selection, specification.    similarity etc. 17.    ... show more

Dutch: deelverzameling
Polish: podzbiór