phenomenalism

/fɪˈnɑmənəˌlɪzəm/
noun
  1. A philosophical theory that only physical objects and events that can be observed or experienced by the senses exist or are real.
    • Phenomenalism argues that tables and chairs are just collections of sensory experiences.
    • Many critics of phenomenalism say it fails to account for objects when no one is observing them.
    • The professor explained phenomenalism as the view that reality is limited to what we perceive.