anomaly

[uh-nom-uh-lee]
noun, plural anomalies.
1.
a deviation from the common rule, type, arrangement, or form. abnormality, exception, peculiarity.
2.
someone or something that is abnormal or incongruous, or does not fit in; an anomalous person or thing: With his quiet nature, he was an anomaly in his exuberant family. abnormality, exception, peculiarity.
3.
an odd, peculiar, or strange condition, situation, quality, etc.
4.
an incongruity or inconsistency.
5.
Astronomy. a quantity measured in degrees, defining the position of an orbiting body with respect to the point at which it is nearest to or farthest from its primary.
6.
Meteorology. the amount of deviation of a meteorological quantity from the accepted normal value of that quantity.
7.
Grammar, irregularity.

Origin:
1565–75; < Latin anōmalia < Greek anōmalía, equivalent to anṓmal(os) anomalous + -ia -ia

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
anomaly (əˈnɒməlɪ)
 
n , pl -lies
1.  something anomalous
2.  deviation from the normal or usual order, type, etc; irregularity
3.  astronomy
 a.  Also called: true anomaly the angle between a planet, the sun, and the previous perihelion of the planet
 b.  Also called: eccentric anomaly the angle between the periapsis of a particular point on a circle round the orbit as seen from the centre of the orbit. This point is obtained by producing a perpendicular to the major axis of the ellipse through the orbiting body until it reaches the circumference of the circle
 c.  Also called: mean anomaly the angle between the periapsis of an orbit and the position of an imaginary body orbiting at a constant angular speed and in the same period as the real orbiting body
4.  geology
 a.  Also called: gravity anomaly a deviation from the normal value of gravity at the earth's surface, caused by density differences at depth, for example those caused by a buried mineral body
 b.  Also called: magnetic anomaly a magnetic field, for example one produced by a buried mineral body, that deviates from an expected or standard value, usually that of the earth's magnetic field
 
anoma'listic
 
adj
 
anoma'listically
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

anomaly
1570s, from L. anomalia, from Gk. anomalia, noun of quality from anomalos "uneven, irregular," from an-, privative prefix, "not" + homalos "even," from homos "same" (see same).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

anomaly a·nom·a·ly (ə-nŏm'ə-lē)
n.
A deviation from the average or norm.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Traditionally, doctors and nurses dealt with babies born with fatal anomalies
  by whisking them away from their mothers to die.
Thaler called these cases anomalies and tacked a list of them to his office
  wall.
Some anomalies can be explained by variations of both phenomena.
The size of the study was essential in enabling the researchers to spot rare
  anomalies.
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