sense datum

noun

1. Also called sensum. Psychology. the basic unit of an experience resulting from the stimulation of a sense organ; a stimulus or an object of perception or sensation.
2. Epistemology. datum(def 3).

noun

1. philosophy a sensation detached both from any information it may convey and from its putative source in the external world, such as the bare awareness of a red visual field. Sense data are held by some philosophers to be the immediate objects of experience providing certain knowledge from which knowledge of material objects is inferredSee also representationalism (def. 1), apriorism

n.

1. A basic, unanalyzable sensation, such as color, sound, or smell, experienced upon stimulation of a sense organ or receptor.