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.

A deviation beyond normal variations.