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	Eng ID	Term	Definition
	1741	expansion factor	In RADIOLOCATION, factor representing the degree to which the hyperbolae belonging to a given group of HYPERBOLIC LINES OF POSITION move apa... more In RADIOLOCATION, factor representing the degree to which the hyperbolae belonging to a given group of HYPERBOLIC LINES OF POSITION move apart as the distance from the BASE LINE increases.
	1742	expert system	A knowledge-based computer system which utilizes artificial intelligence to do some of the inferential computation/decision making.
	1743	exploration drilling	Drilling operations aimed at the exploration of resources.
	1744	exploratory survey	See SURVEY.
	1745	explosive anchorage area	An area set apart for anchored ships discharging or receiving explosives.
	1746	explosive fog signal	See FOG SIGNAL.
	1747	exposure	In PHOTOGRAPHY, the act of exposing a light-sensitive material to a light source. The total quantity of light received per unit area on a se... more In PHOTOGRAPHY, the act of exposing a light-sensitive material to a light source. The total quantity of light received per unit area on a sensitized PLATE or film; may be expressed as the product of the light intensity and the EXPOSURE TIME.
	1748	exposure interval	The time interval between the taking of successive PHOTOGRAPHS.
	1749	exposure station	See AIR STATION.
	1750	exposure time	The time during which a light-sensitive material is subjected to the action of light.
	1751	exterior orientation	See ORIENTATION.
	1752	exterior perspective centre	See PERSPECTIVE CENTRE.
	1753	external error	See ERROR: THEORETICAL.
	1754	extinction coefficient	A measure of the space rate of diminution or extinction, of any transmitted light. In OCEANOGRAPHY, the measure of ATTENUATION of downward d... more A measure of the space rate of diminution or extinction, of any transmitted light. In OCEANOGRAPHY, the measure of ATTENUATION of downward directed light radiation in the SEA.
	1755	extrapolation	The process of estimating the value of a quantity beyond the limits of known values by assuming that the rate or system of change between th... more The process of estimating the value of a quantity beyond the limits of known values by assuming that the rate or system of change between the last few known values continues.
	1756	extremely high frequency (EHF)	See FREQUENCY: RADIO.
	1757	extrusion	In CARTOGRAPHY, the extension of detail outside the NEAT LINE.
	1758	eye base	See INTERPUPILLARY DISTANCE.
	1759	eye of the storm	See TROPICAL CYCLONE.
	1760	eyepiece	In an optical device, the lens group which is nearest the eye and with which the IMAGE formed by the preceding elements is viewed.
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