azimuth
UK[ˈazɪməθ]US[ˈæzɪməθ]
n
The horizontal direction of a celestial object (like a star or the sun), measured clockwise in degrees from a true north or south reference point.
n
The horizontal angle or direction of a bearing, especially in navigation, surveying, or gunnery.
Etymology
The word 'azimuth' entered English in the late 14th century from Old French 'azimut', which was derived from the Arabic term 'as-sumūt', meaning 'the ways' or 'the directions'. This Arabic term is itself the plural of 'as-samt', translating to 'the way, direction, or path'. The transmission of this precise astronomical and navigational term from Arabic to medieval Latin and then into European vernaculars reflects the significant influence of Islamic science on medieval European astronomy and mathematics. The core semantic logic has remained remarkably stable, evolving from the general Arabic concept of 'directions' to the specific, technical meaning of an angular measurement in a horizontal plane.
Analysis
This word is a loanword adopted as a single, unsegmentable unit into English from medieval Latin and ultimately from Arabic.
Examples
The sailor calculated the ship's position using the sun's azimuth.
Adjust the telescope's azimuth before aligning its elevation.
In surveying, the azimuth is a crucial measurement for mapping boundaries.