aberration

noun

ab·​er·​ra·​tion ˌa-bə-ˈrā-shən 

1

a

: the fact or an instance of deviating or being aberrant especially from a moral standard or normal state

aberrations of character

b

: something or someone regarded as atypical and therefore able to be ignored or discounted

Harkins was to be regarded as an aberration among American military leaders …

—Neil Sheehan

The U.S. establishment treated this grassroots movement almost as an aberration, virtually ignoring it.

—Helen Caldicott

As for Putin's desire to lay waste to Chechnya, Western leaders largely dismiss it as an aberration …

—The New Republic

2

: failure of a mirror, refracting surface, or lens to produce exact point-to-point correspondence between an object and its image

chromatic aberration

… the telescope suffers from a serious focusing problem, a condition known as spherical aberration, which causes the point-like images of stars to be surrounded by fuzzy haze.

—M. Mitchell Waldrop

3

: unsoundness or disorder of the mind

4

: a small periodic change of apparent position in celestial bodies due to the combined effect of the motion of light and the motion of the observer

5

: an aberrant individual

aberrational

ˌa-bə-ˈrā-sh(ə-)nəl 

adjective

aberrational behavior

They react, often in anger, to particular decisions but tend to regard them as aberrational rather than systemic failures.

—Robert H. Bork

Synonyms

• dementia
• insanity
• hysteria
• schizophrenia
• madness
• instability

Examples of aberration in a Sentence

Recently geneticists have taken a closer look at a genetic aberration previously considered rare … . The genes may be perfectly normal, yet there is a shortage or surplus of DNA sequences that may play a role in diseases that defy straightforward genetic patterns … —Melinda Wenner, Scientific American, June 2009

He did hit five homers for Texas in 1987, but that was an aberration. In no other major league season has he hit more than three, and last season he actually came up with a goose egg. —E. M. Swift, Sports Illustrated, 5 Apr. 1989

Gilliard's studies of numerous bird of paradise species brought them from the realm of exotic aberrations to the forefront of sociobiology. —Jared M. Diamond, Nature, 24-30 Sept. 1981

For her, such a low grade on an exam was an aberration.

a study of sexual aberration

Recent Examples on the Web

With the acquisition of Devers, the Giants are trying to prove that these past few months haven’t been an aberration. —Andy McCullough, New York Times, 18 June 2025

Judged by these standards, Trump’s first term—with its near-unequivocal support for Israel’s regional ambitions—was an aberration. —Aluf Benn, Foreign Affairs, 5 June 2025

Schlapp: The people who get up every morning listen to NPR might be hoping that this was an aberration, that this is something of a cult of personality movement, and that when Donald Trump isn't the president anymore, this will go back to some kind of normalcy of what the situation was before. —Leila Fadel, NPR, 29 May 2025

Gone are the days when Trump could be regarded as an aberration in America’s otherwise predictable geopolitics. —Ian Bremmer, Time, 24 May 2025

Word History

Etymology

borrowed from Latin aberrātiōn-, aberrātiō "diversion, relief," from aberrāre "to wander away" + -tiōn-, -tiō, suffix of action nouns — more at aberrant entry 1

First Known Use

1588, in the meaning defined at sense 1a

Phrases Containing aberration

• chromatic aberration
• spherical aberration

Rhymes for aberration

• abdication
• abjuration
• abnegation
• abrogation
• acceptation
• acclamation
• acclimation
• accusation
• activation
• actuation
• acylation
• adaptation

Kids Definition

aberration

noun

ab·​er·​ra·​tion ˌab-ə-ˈrā-shən 

1

: the act of differing especially from a moral standard or normal state

2

: unsoundness or disorder of the mind

3

: a small regularly occurring change of apparent position in heavenly bodies due to the combined effect of the motion of light and the motion of the observer

Medical Definition

aberration

noun

ab·​er·​ra·​tion ˌab-ə-ˈrā-shən 

1

: failure of a mirror, refracting surface, or lens to produce exact point-to-point correspondence between an object and its image

2

: unsoundness or disorder of the mind

3

: an aberrant organ or individual

aberrational

-shnəl, -shən-əl 

adjective