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Related to attitude indicator: Heading indicator
See artificial horizon.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
An instrument which displays the attitude of the aircraft by reference to sources of information which may be contained within the instrument or be external to it. When the sources of information are self-contained, the instrument may be referred to as an artificial horizon.
Dictionary of Military and Associated Terms. US Department of Defense 2005.