1. (n.) Deviation from what is proper or normal\, especially from truth or moral rectitude, from the natural state, or from a type.

2. (n.) A partial alienation of reason.

3. (n.) A small periodical change of position in the stars and other heavenly bodies, due to the combined effect of the motion of light and the motion of the observer; called annual aberration, when the observer's motion is that of the earth in its orbit, and daily or diurnal aberration, when of the earth on its axis; amounting when greatest, in the former case, to 20.4'', and in the latter, to 0.3''. Planetary aberration is that due to the motion of light and the motion of the planet relative to the earth.

4. (n.) The convergence to different foci, by a lens or mirror, of rays of light emanating from one and the same point, or the deviation of such rays from a single focus; called spherical aberration, when due to the spherical form of the lens or mirror, such form giving different foci for central and marginal rays; and chromatic aberration, when due to different refrangibilities of the colored rays of the spectrum, those of each color having a distinct focus.

5. (n.) The passage of blood or other fluid into parts not appropriate for it.

6. (n.) The producing of an unintended effect by the glancing of an instrument, as when a shot intended for A glances and strikes B.

aberrance aberrancy abet abnormality abnormity alienation amorphism anomalism anomalousness anomaly bend bias brain damage brainsickness branching off centrifugence circuitousness clouded mind conceit corner crackpotism crank crankiness crankism craziness crook crosswiseness crotchet crotchetiness curiosity curve daftness decentralization declination defectiveness deflection deflexure delusion dementedness dementia departure deployment derangement detour deviance deviancy deviation deviousness diagonality difference differentness digression discursion disorientation distortion distraction divagation divarication divergence divergency diversion division dogleg dottiness double drift drifting eccentricity errancy errantry erraticism erraticness erroneousness error excursion excursus exorbitation fallaciousness fallacy falseness falsity fanning fanning out fault faultiness flaw flawedness folie foment freakiness freakishness furor hairpin hamartia heresy heterodoxy heteromorphism idiocrasy idiosyncrasy illusion indirection indirectness inferiority insaneness insanity instigate irrationality irregularity kink loss of mind loss of reason lunacy madness maggot mania mannerism mental deficiency mental derangement mental disease mental disorder mental disturbance mental illness mental instability mental sickness mind overthrown mindsickness misapplication misconstruction misdoing misfeasance misinterpretation misjudgment mistake monstrosity nonconformity obliqueness obliquity oddity oddness peccancy peculiarity pererration perversion pixilation possession prodigy provoke psychopathy queerness quip quirk quirkiness rabidness raise rambling rarity reasonlessness self-contradiction senselessness separation set set on shattered mind sheer shift shifting shifting course shifting path sick mind sickness sin sinfulness singularity skew skewness slant slip splaying spread spreading spreading out squint stir up strangeness straying subnormality superiority sweep swerve swerving swinging tack teratism transverseness trick turn turning twist unbalance unbalanced mind unconventionality unnaturalism unnaturalness unorthodoxy unsaneness unsound mind unsoundness unsoundness of mind untrueness untruth untruthfulness vagary variation veer wandering warp whim whimsicality whimsy witlessness wrong wrongness yaw zigzag