1 A sensory experience elicited by a stimulus in a different sensory modality, as when particular sounds evoke sensations of colour. See also chromaesthesia, photism (1).
2 The experience of a sensation in a different part of the body from the area of stimulation. See also referred pain. Also called synaesthesis. US synesthesia, synesthesis. [From Greek syn together + aisthesis feeling + -ia indicating a condition or quality]