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	Eng ID	Term	Definition
	21	accuracy	The extent to which a measured or enumerated value agrees with the assumed or accepted value. See PRECISION.
	22	accuracy: absolute	The evaluation of all errors encountered in defining the position of a single feature or point on a GEODETIC DATUM or system.
	23	accuracy: relative	The evaluation of the RANDOM ERRORS in determining the positional orientation of one point or feature with respect to another.
	24	accuracy: repeatable	See REPEATABLE ACCURACY.
	25	achromat	See ACHROMATIC LENS.
	26	achromatic lens	A compound LENS that has been partly corrected forchromatic aberration.Such a LENS is customarily made to bring green and red LIGHT RAYS to ... more A compound LENS that has been partly corrected forchromatic aberration.Such a LENS is customarily made to bring green and red LIGHT RAYS to approximately the same point focus. Also calledachromat. See ABERRATION OF LIGHT.
	27	aclinic line	See EQUATOR: MAGNETIC.
	28	acoustic	Science of sound, including its production, transmission and effects.
	29	acoustic bearing	See BEARING: SONIC.
	30	acoustic line of position	See SONIC LINE OF POSITION.
	31	acoustic navigation	See NAVIGATION: SONIC.
	32	acoustic sounding	See ECHO SOUNDING.
	33	acoustic wave	See WAVE: SOUND.
	34	active satellite	An artificial satellite which transmits an electromagnetic signal. A satellite with the capability to transmit, repeat, or retransmit electr... more An artificial satellite which transmits an electromagnetic signal. A satellite with the capability to transmit, repeat, or retransmit electromagnetic information as contrasted with passive satellite. 2. As defined by the International Telecommunication Union (ITU), an earth satellite carrying a station intended to transmit or retransmit radiocommunication signals.
	35	active system	Any electromagnetic or sonic position fixing system operating with an interrogation-response procedure. See also PASSIVE SYSTEM.
	36	active tracking system	A satellite system which operates by transmission of signals to and receipt of responses from the satellite.
	37	adiabatic process	A thermodynamic change of state of a system in which there is no transfer of heat or mass across the BOUNDARIES of the system. In an adiabat... more A thermodynamic change of state of a system in which there is no transfer of heat or mass across the BOUNDARIES of the system. In an adiabatic process, compression always results in warming, expansion in cooling.
	38	adiabatic temperature change	RISE or fall of temperature due to compression or expansion without gain or loss of heat to the surroundings.
	39	adjacent coasts	The coasts lying either side of the land boundary between two adjoining States.
	40	adjusted position	See POSITION.
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