The horizontal direction reckoned clockwise from the meridian plane.
The angle measured on the horizon between the meridian and the plane of the vertical circle through a celestial body or other object. Most government agencies reckon with azimuth clockwise from south, 0° to 360°.
Azimuth of a body is the arc of the horizon intercepted between the north or south point and the foot of the vertical circle passing through the body. It is reckoned in degrees from either the north or south point clockwise entirely around the horizon. Azimuth of a current is the direction toward which it is flowing, and is usually reckoned from the north point.
The angular distance between true south and the point on the horizon directly below the sun. Typically used as an input for opaque surfaces and windows in computer programs for calculating the energy performance of buildings.
The direction, in degrees referenced to true north, that an antenna must be pointed to receive a satellite signal (compass direction). The angular distance is measured in a clockwise direction.
Azimuth has been defined 13 different ways in documents like Glossaries of BLM Surveying and Mapping Terms, Glossaries of BLM Surveying and Mapping Terms, Glossary of Wildland Fire Terminology, and 7 more.