monomorphism

《近世代数》 · 第 51 页

若群 $G$ 到 $G'$ 的同态 $\sigma$ 是单射，则称 $\sigma$ 是单同态；若 $\sigma$ 是满射，则称 $\sigma$ 是满同态。

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《Lecture Notes on Bayesian Estimation and Classification》 · 第 18 页 · Section 1.4「Homomorphisms and Quotient Groups」，小节「Monomorphisms, Epimorphisms, and Isomorphisms」

An injective (or one-one) homomorphism is called a monomorphism and a surjective (or onto) homomorphism an epimorphism; of course a bijective homomorphism is what we have been calling an isomorphism.