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Noun
1. coset; residue classMathematics
Wikipedia definition
2. CosetIn mathematics, if G is a group, and H is a subgroup of G, and g is an element of G, then gH = {gh : h an element of H } is a left coset of H in G, and Hg = {hg : h an element of H } is a right coset of H in G. Only when H is normal will the right and left cosets of H coincide, which is one definition of normality of a subgroup. A coset is a left or right coset of some subgroup in G.
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