semigroup

[ sem-ee-groop ]
/ ˈsɛm iˌgrup /

noun Mathematics.

an algebraic system closed under an associative binary operation.

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seclusion

Origin of semigroup

First recorded in 1925–30; semi- + group
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021