The act of hallucinating; a wandering of the mind; an error, mistake or blunder.
A confident but incorrect response given by an artificial intelligence.
A sensory perception of something that does not exist, often arising from disorder of the nervous system, as in delirium tremens.
A system of training to improve the memory.
A memory card game in which a pack of cards is spread out face-down and players try to turn up pairs with the same symbol.