a subset of a group, formed by the consistent operation of a given element of the group on the left or right of all the elements of a subgroup of the group.
Origin of coset
First recorded in 1925–30; co- + set
Words nearby coset
cosecant, cosech, coseismal, Cosell, Cosenza, coset, Cosgrave, cosh, cosher, Coshocton, Così fan tutte