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1. Music exactly in tune
2. (of a compass bearing) according to the earth's geographical rather than magnetic poles
3. Biology conforming to the typical structure of a designated type
4. Physics not apparent or relative; taking into account all complicating factors
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
Related to true north.
(science and technology)
Actual, as constrasted with fictitious, such as true sun.
Related to a fixed point, either on the earth or in space, in contrast with relative, which is related to a moving point.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.