An aberration is something strange that rarely occurs. An example of an aberration is when the temperature hits 90 degrees in January — it's nice and warm, but it's really strange.
The noun aberration often refers to something that doesn't fit with current moral standards, or is something that shows a mental lack of control. Aberration comes from the Latin word that means "to wander, go astray." Today, you'd say it was an aberration to send little children to work in coal mines and factories and not to school, which was common in the nineteenth century. There's a very old poem called "The Chimney Sweep" about a boy who cleans chimneys and is only about five years old!
n a state or condition markedly different from the norm
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chromosomal aberration, chromosomal anomaly, chromosonal disorder, chrosomal abnormality
any change in the normal structure or number of chromosomes; often results in physical or mental abnormalities
a twist or aberration; especially a perverse or abnormal way of judging or acting
chromosomal abnormality consisting of the absence of one chromosome from the normal diploid number
chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell
any disease or abnormality that is determined by the sex hormones