01 a. Existing in the mind, but below the surface or threshold of consciousness; that is, existing as feeling rather than as clear ideas.
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1.
Existing in the mind, but below the surface or threshold of consciousness; that is, existing as feeling rather than as clear ideas.(Philos.)
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2.
having or using an intensity of sensory stimulus insufficient to be perceived consciously, but having an effect on unconscious mental processes; as, subliminal advertising.