Astronomy, Navigation. the arc of the horizon measured clockwise from the south point, in astronomy, or from the north point, in navigation, to the point where a vertical circle through a given heavenly body intersects the horizon.
Surveying, Gunnery. the angle of horizontal deviation, measured clockwise, of a bearing from a standard direction, as from north or south.

1350–1400; Middle English azimut < Middle FrenchArabic as sumūt the ways (i.e., directions)

azimuthal [az-uh-muhth-uhl] , adjective
azimuthally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
azimuth (ˈæzɪməθ)
1.  astronomy, nautical Compare altitude the angular distance usually measured clockwise from the north point of the horizon to the intersection with the horizon of the vertical circle passing through a celestial body
2.  surveying the horizontal angle of a bearing clockwise from a standard direction, such as north
[C14: from Old French azimut, from Arabic as-sumūt, plural of as-samt the path, from Latin semita path]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"distance of a star from the north or south point of the meridian," late 14c., from O.Fr. azimut, from Arabic as-sumut "the ways," pl. of as-samt "the way, direction" (see zenith).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
azimuth   (āz'ə-məth)  Pronunciation Key 
The position of a celestial object along an observer's horizon. Azimuth is a horizontal angle measured clockwise in degrees from a reference direction, usually the north or south point of the horizon, to the point on the horizon intersected by the object's line of altitude (a line from the observer's zenith through the object to the horizon). If north is the reference point (0°), then east has an azimuth of 90°, south is 180°, and so forth through 360°. See more at altazimuth coordinate system.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The number above the beginning of each trace is the source azimuth and below is the epicentral distance.
The measured leaf azimuth angles and leaf zenith angles were distributed into bins based their angle values.
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