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Eng ID Term Definition
1
abeam
In a line approximately at right angles to the ship's keel; also: the waist or middle part of the ship.
2
aberration of light
In ASTRONOMY, the apparent displacement in position of a HEAVENLY BODY caused by the combination of the VELOCITY of light and that of an obs... more
In ASTRONOMY, the apparent displacement in position of a HEAVENLY BODY caused by the combination of the VELOCITY of light and that of an observer on the surface of the EARTH. Aberration of light due to the ROTATION of the EARTH on its AXIS is termed diurnal aberration. That due to the REVOLUTION of the EARTH around the SUN is termed annual aberration. In optics, failure of an OPTICAL SYSTEM to bring all LIGHT RAYS received from a point object to a single IMAGE POINT or to a prescribed geometric position. Spherical aberration is caused by RAYS from various zones of a LENS or MIRROR coming to FOCUS at different distances from the LENS or MIRROR. Chromatic aberration (or chromatism) is due to the differences in REFRACTION of the coloured RAYS of the SPECTRUM; those of each colour having a different FOCUS.
3
abrasion
The wearing away or rounding of surfaces by friction.
4
abscissa
See COORDINATES: PLANE RECTANGULAR.
5
absolute accuracy
See ACCURACY: ABSOLUTE.
6
absolute error
See ERROR.
7
absolute orientation
See ORIENTATION.
8
absolute stereoscopic parallax
See PARAL­LAX.
9
absorption: atmospheric
Transformation of RADIANT ENERGY into thermal, mechanical, electrical, etc. energy, by interaction with atmospheric constituents.
10
abyssal
Belonging to the lowest DEPTHS of the OCEAN, generally below 3,700 METRES (2,000 FATHOMS).
11
abyssal gap
A gap in a sill, ridge, or rise that lies between two abyssal plains.
12
abyssal hill
An isolated small elevation on the deep seafloor.
13
abyssal plain
An extensive, flat, gently sloping or nearly level region at abyssal depths.
14
acceleration
The rate of change of VELOCITY.
15
acceleration: angular
The rate of change of ANGULAR VELOCITY.
16
acceleration of gravity
The ACCELERATION of a freely falling body caused by the force of GRAVITY.
17
accidental error
See ERROR.
18
acclivity
An upward SLOPE of GROUND; as opposed to DECLIVITY.
19
accommodation
The faculty of the human eye to adjust itself to give sharp IMAGES for different object distances. In STEREOSCOPY, the ability of the eyes t... more
The faculty of the human eye to adjust itself to give sharp IMAGES for different object distances. In STEREOSCOPY, the ability of the eyes to bring two IMAGES into superimposition for stereoscopic viewing.
20
accretion
The gradual building up of LAND over a long period of time, solely by the action of the forces of nature, on a BEACH by deposition of water ... more
The gradual building up of LAND over a long period of time, solely by the action of the forces of nature, on a BEACH by deposition of water or air-borne material. Artificial accretion is a similar build-up of LAND by reason of an act of man. Also called aggradation.