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Definition of Aether
1. Noun. Personification of the sky or upper air breathed by the Olympians; son of Erebus and night or of Chaos and darkness.
Generic synonyms: Greek Deity
2. Noun. A medium that was once supposed to fill all space and to support the propagation of electromagnetic waves.
Definition of Aether
1. the upper region of the atmosphere [n -S] : AETHERIC [adj]