from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An instrument that indicates the pitching and banking of an aircraft by displaying the movement of a representation of the aircraft in relation to a line representing the horizon.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun aviation An
instrumentthat displays the pitchand rollof an aircraft in flight by comparing its attitude to a gyroscopically-maintained indication of the flat horizon line.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a navigational instrument based on a gyroscope; it artificially provides a simulated horizon for the pilot
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