According to a tradition that traces back at least to Plato, intuitions are a form of intellectual perception. The rough idea is this: while sensory perceptions are experiences that purport to, and sometimes do, reveal how matters stand in concrete reality by making us sensorily aware of that reality, intuitions are experiences that purport to, and sometimes do, reveal how matters stand in abstract reality by making us intuitively aware of that reality. The aim of Intuition is to elaborate and defend such a view of the phenomenology, epistemology, and metaphysics of intuition. Along the way the book takes up related issues such as the a priori, perceptual justification and knowledge, concept possession, inference, skeptical challenges to intuition, and awareness of abstract objects.