philosophy - the rational investigation of questions about existence and knowledge and ethics

bioethics - the branch of ethics that studies moral values in the biomedical sciences

casuistry - moral philosophy based on the application of general ethical principles to resolve moral dilemmas

endaemonism, eudemonism - an ethical system that evaluates actions by reference to personal well-being through a life based on reason

hedonism - an ethical system that evaluates the pursuit of pleasure as the highest good