Relating to or resembling ether; extremely light, delicate, or spiritual in nature.
From Latin 'aetherius' and Greek 'aithēr' (upper air, pure air), originally referring to the element thought to fill space above the terrestrial world. In medieval and modern usage, the term was adapted for spiritual or immaterial contexts.
Spiritualists in the 19th century used 'etheric' to describe invisible spiritual realms and bodies—they believed you had an 'etheric double' that could leave your physical body, which is why the word still sounds mystical today.
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