Intuitionalism is a philosophical concept that describes the belief that certain fundamental moral truths can be directly intuited or perceived by individuals. There are several synonyms for this term, including ethical intuitionism, moral intuitionism, and intuitive morality. These terms all refer to the idea that moral principles can be grasped through personal intuition rather than through reason or empirical investigation alone. Other related concepts include moral realism, which asserts that moral truths are objective and independent of individual opinions, and moral relativism, which denies the existence of universal moral principles. Overall, intuitionalism emphasizes the vital role of intuition in forming our moral beliefs and guiding our actions.