semigroup (plural semigroups)
(mathematics) Any set for which there is a binary operation that is closed and associative.
• (set for which a closed associative binary operation is defined): magma
• (set for which a closed associative binary operation is defined): group, monoid
Source: Wiktionary
24 June 2025
(noun) very small (to 3 inches) flattened marine fish with a sucking disc on the abdomen for clinging to rocks etc.
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