from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. In which each submodule is a direct summand.
- adj. For which every invariant subspace has an invariant complement, equivalent to the minimal polynomial being squarefree.
- adj. Being a direct sum of simple Lie algebras.
- adj. Being a linear algebraic group whose radical of the identity component is trivial.
semi- + simple (Wiktionary)