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McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
i. The rotation of an aircraft or a missile about its vertical axis so as to cause its longitudinal axis to deviate from the flight line or heading in its horizontal plane. Also known as yawing.
ii. To rotate or oscillate about a vertical axis.
iii. The rotation of a camera or a photograph coordinate system about either the photograph's z-axis or the exterior's z-axis.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved