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coset

[koh-set]
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noun Mathematics.
  1. 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.
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Origin of coset

First recorded in 1925–30; co- + set
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018