phenomenalism

The doctrine, set forth by David Hume and his successors, that percepts and concepts constitute the sole objects of knowledge, with the objects of perception and the nature of the mind itself remaining unknowable.

The philosophical doctrine that the phenomenal and the real are identical —that phenomena are the only realities. Also called externalism.

That theory which limits positive or scientific knowledge to phenomena only, whether material or spiritual.

The doctrine that physical objects exist only as perceptual phenomena or sensory stimuli