Theories claiming that there is just one defining feature of moral personhood, is called as?

The theories claiming that there is just one defining feature of moral personhood are known as monistic theories of moral personhood. These theories posit that moral personhood can be defined by a single characteristic or criterion that accounts for what it means to be a moral agent. This contrasts with pluralistic theories, which suggest that multiple features may contribute to the concept of moral personhood. For instance, some monistic theories may argue that the capacity for rational thought is the sole defining feature, while others may focus on the ability to experience suffering or have interests. Ultimately, the debate around moral personhood is fundamental in ethics and philosophy, as it influences discussions about rights, responsibilities, and moral consideration extended to different entities.