What does clairvoyant mean? clairvoyant. Adjective 1. Of or relating to clairvoyance. 2. Able to see things that cannot be perceived by the normal senses. 3. Able to foresee the future. 4. (computing) ; Relating to a form of parallel processing algorithm given advance information about the problem. clairvoyant. Noun 1. A person able to see things that cannot be perceived by the normal senses. 2. A person able to foresee the future.