In a manner that shares the same axis, or in a way that is aligned along a common central line.
From 'coaxial' (sharing an axis) + '-ly' (an adverb-forming suffix). This technical term is used in physics, engineering, and electronics to describe precise alignment.
Microscopes, telescopes, and laser systems all rely on components being positioned coaxially—if the lenses don't line up perfectly along the same axis, the image becomes blurry or the light beam gets scattered in useless directions.
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