Also found in: Dictionary, Thesaurus, Medical, Financial, Wikipedia.


1. Astronomy
a. the angle between a planet, the sun, and the previous perihelion of the planet
b. 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. 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
2. Geology
a. 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. 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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
Anomalyclick for a larger image


Any of three related angles by means of which the position, at a particular time, of a body moving in an elliptical orbit can be calculated. For a body S moving around the focus, F, of an orbit (see illustration), the true anomaly is the angle v made by the body, the focus, and the point, P, of nearest approach. For a body orbiting the Sun, P is the perihelion. The angle is measured in the direction of motion of S. If an auxiliary circle is drawn centered on the midpoint, C, of the major axis of the elliptical orbit, then the eccentric anomaly is the angle E between CS′ and CP, where S′ lies on the circle and is vertically above S. The mean anomaly is the angle M between P, F, and a hypothetical body moving at a constant angular speed equal to the mean motion of S. It is thus the product of the mean motion and the time interval since S passed P.

The eccentric and mean anomalies are related by Kepler's equation:

E e sinE = M

where e is the eccentricity of the orbit. The coordinates (x , y) of the body S can be found from the equations

x = a (cosE e )

y = a sinE √(1 – e 2)

where a is the semimajor axis of the orbit. See also equation of center; orbital elements.

Collins Dictionary of Astronomy © Market House Books Ltd, 2006


In celestial mechanics, the angle between the radius vector to an orbiting body from its primary (the focus of the orbital ellipse) and the line of apsides of the orbit, measured in the direction of travel, from the point of closest approach to the primary (perifocus). Also known as true anomaly.
An abnormal deviation from the characteristic form of a group.
A local deviation from the general geological properties of a region.
Any part of the body that is abnormal in its position, form, or structure.
The deviation of the value of an element (especially temperature) from its mean value over some specified interval.
The difference between conditions actually observed at a serial station and those that would have existed had the water all been of a given arbitrary temperature and salinity.
(science and technology)
A deviation beyond normal variations.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


Abnormality or deviation. Pronounced "uh-nom-uh-lee," it is a favorite word among computer people when complex systems produce output that is inexplicable. See software conflict and anomaly detection.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
The IP anomaly starts at around 100 metres below the past drill hole intersections that contained widespread gold and silver mineralization in epithermal veins.
"The initial tests completed successfully but the final test resulted in an anomaly on the test stand," said SpaceX in a statement.
Socioeconomic inequalities in risk of congenital anomaly. Arch Dis Child 2000;82(5):349-52.
In fact, part of our success as a species can be attributed to anomaly detection.
Ebstein anomaly (EA) is a rare cardiac congenital abnormality characterized by downward displacement of the posterior and septal leaflets of the tricuspid valve which results in atrialization of the right ventricle, enlargement of the right atrium and tricuspid regurgitation.
After detecting the anomaly traffic, we can immediately trigger the mitigation mechanism to install defense flow table rules onto data plane switches to prevent the further attack.
At 36 DPH, a total of 39.5% juvenile had anomalies of which 12.5% had one type of anomaly while 27% had multiple anomalies.
Maternal mortality due to Ebstein anomaly is considered to be less than 1% in asymptomatic patients but may be as high as 5-15%, if aggravated by conditions like supraventricular arrhythmia, WPW syndrome or atrial fibrillation (4).
In previous studies, Uslu et al3 showed that tooth agenesis was the most commonly found dental anomaly in orthodontic patients.
The December 2015 average temperature broke a record in France, with an anomaly of +4.1[degrees]C (Fig.
There is a remarkable northerly moisture transport anomaly from Eastern Kenya (i.e., sourced from the maritime tropical Indian Ocean which turns northerly after crossing the Somali coast, Figure 7(a)) towards the NEH and northern coast of the study area where it converges with the westerly/northwesterly moisture anomaly.
Type I anomalies are purely ectodermal origin and contain squamous epithelium; this type of anomaly develops medial to the concha, often extending into the postauricular crease and ending in a cul-de-sac at the osseouscartilaginous junction of the external auditory canal.