WordReference Random House Unabridged Dictionary of American English © 2024sense′ da′tum, - PsychologyAlso called sensum. the basic unit of an experience resulting from the stimulation of a sense organ;
a stimulus or an object of perception or sensation. - Philosophy[Epistemology.]datum (def. 3).
Collins Concise English Dictionary © HarperCollins Publishers::
sense datum n - 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 inferred