subliminal definitions WordNet (r) 3.0 (2005) adj 1: below the ... 2. existing or functioning below the threshold of consciousness < the subliminal mind > < subliminal advertising > • subliminally adverb Oxford Reference Dictionary adj. Psychol. (of a ... below the threshold of sensation or consciousness. Phrases and idioms: subliminal advertising the use of subliminal images in advertising on television etc. to influence the viewer at an unconscious level. subliminal self the part of one's personality outside conscious ...