Relating to or characterized by hallucinations; involving false sensory perceptions.
From hallucination (Latin hallucinatio) plus the adjectival suffix -al, which transforms nouns into adjectives describing relationship or quality.
The hallucinational experience is unique to each person's brain—your hallucination of a voice sounds exactly as real as actual sound because it's firing the same neural pathways, which is why hallucinations feel undeniably real to the person experiencing them.
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