(group theory) Any (often, but not necessarily, abelian) group whose binary operation is called addition.

(US, education) The period in school that comes after second grade and before fourth grade.

(historical) One of a group of mercenaries of Italian origin, hired from their home in Campania by Agathocles (361–289 BCE), Tyrant of Syracuse and self-proclaimed King of Sicily.

Commonwealth of Nations standard spelling of color coordinate.