\begin{definition}[Definition:Aether/Historical Note]
The existence of the aether or ether, as a hitherto undetected entity in physics was posited as late as the $20$th century as a medium through which electromagnetic radiation was able to travel.
Its existence was disproved by the Michelson-Morley Experiment.
Category:Definitions/Philosophy
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Prime.mover
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\end{definition}