semigroup

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sem·i·group

 (sĕm′ē-gro͞op′, sĕm′ī-)
n. Mathematics
A set for which there is a binary operation that is closed and associative.

semigroup

(ˈsɛmɪˌɡruːp)
n
a set together with an associative binary operation
Translations
semigruppo