aberration

1 a serious mental disorder that prevents one from living a safe and normal life Joan of Arc was certain the voices she had been hearing were not a manifestation of some sort of aberration Synonyms insanity, dementia, derangement, lunacy, madness, mania, rage [archaic]Related Words neurosis, psychosis; instability, irrationality, unreasonableness; delirium, frenzy, hysteria; hallucinosis, hypomania, paranoia, schizophrenia; senile dementia; delusion, hallucination; monomania, obsession, phobia; abnormality, dementedness, unsoundnessNear Antonyms lucidity, rationality, rationalness, reasonability, reasonableness; normality, soundnessAntonyms mind, saneness, sanity

2 something that is different from what is ordinary or expected there are some slight aberrations in the type due to the nature of old printing presses Synonyms anomaly, abnormality, exception, oddity, oddment, rarityRelated Words curiosity, peculiarity, singularity; accident, bizarrerie, phenomenon, quirk, vagary; distortion, kink, mutation, variation; difference, disparity, inconsistence, inconsistency; error, mistake; contradiction, paradoxNear Antonyms norm, ordinary, usual