The Collaborative International Dictionary
Phenomenalism \Phe*nom"e*nal*ism\, n. (Metaph.) That theory which limits positive or scientific knowledge to phenomena only, whether material or spiritual.
Douglas Harper's Etymology Dictionary
1865 (John Grote), from phenomenal + -ism. Related: Phenomenalist.
Wiktionary
n. (context philosophy English) The doctrine that physical objects exist only as perceptual phenomenon or sensory stimulus
Wikipedia
Phenomenalism is the view that physical objects cannot justifiably be said to exist in themselves, but only as perceptual phenomena or sensory stimuli (e.g. redness, hardness, softness, sweetness, etc.) situated in time and in space. In particular, some forms of phenomenalism reduce talk about physical objects in the external world to talk about bundles of sense-data.
Usage examples of "phenomenalism".
Equally alluring was the reverse agenda: elevate all matter and bodies to the status of mental events (as in the phenomenalism of Mach or Berkeley).