What does azimuthally mean?
Azimuthally is an adverb used almost exclusively in science and engineering to describe anything done, measured, or varying in the horizontal angular direction around a central point or axis — that is, in relation to the azimuth. The azimuth itself is the familiar compass bearing: the clockwise angle from north to a point on the horizon. When physicists say a magnetic field is 'azimuthally symmetric,' they mean it looks the same from every compass direction around the axis; when engineers say a radar was scanned azimuthally, they mean it swept sideways through angles rather than up and down in elevation. The word derives ultimately from Arabic astronomy, entering European science through medieval translations of astronomical texts. Though obscure to lay readers, it is indispensable in optics, plasma physics, antenna design, and geophysics, where distinguishing horizontal angular behavior from vertical (elevation) behavior matters greatly.
adverbIn a manner relating to or measured along the azimuth — that is, in the horizontal angular direction around a central point or axis. Used chiefly in technical and scientific contexts to describe variation, orientation, or measurement in the angular (compass-direction) plane.
- In a direction or manner relating to azimuth: describing variation, movement, symmetry, or measurement in the horizontal angular plane around a central axis.
"The antenna's beam width was measured azimuthally at several elevations."
"The telescope tracked the satellite azimuthally, rotating smoothly along the horizontal plane."
"Physicists found the magnetic field to be azimuthally symmetric, identical in every compass direction around the axis."
Every time a satellite dish finds your TV signal, it's doing exactly what azimuthally describes: sweeping horizontally around a circle until it locks on.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of azimuthally
Azimuthally derives from 'azimuth', which entered English in the late Middle Ages from Arabic al-sumūt ('the directions' or 'the paths'), transmitted through Old Spanish and medieval Latin astronomical texts. The adjective form 'azimuthal' developed within English scientific usage, likely in the 18th or 19th century as quantitative physics demanded precise terminology for angular measurement. The adverb 'azimuthally' was then formed by adding the standard adverbial suffix -ly. Its cognates include other celestial-coordinate terms such as zenith and nadir, which likewise passed from Arabic into European languages during the same period of astronomical translation.
Related word forms
How azimuthally is actually used
A technical term confined almost entirely to physics, engineering, astronomy, radar, and geophysics. It rarely appears outside scientific literature and would be unfamiliar to most general readers. Often used with 'symmetric', 'averaged', 'integrated', or 'polarized' in describing fields, beams, or data distributions around an axis.
Easily confused with azimuthally
Azimuthal is the adjective describing something related to azimuth, while azimuthally is its adverbial form describing action or variation done in an azimuthal manner.
Altitude is the vertical angle above the horizon, whereas azimuth is the horizontal angle measured clockwise from north; azimuthally therefore refers only to the horizontal angular dimension.