[ koh-set ]
/ ˈkoʊ sɛt /

noun Mathematics.

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 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019