aether

Noun
  1. Personification of the sky or upper air breathed by the Olympians;
    Son of Erebus and night or of Chaos and darkness (synset 109576728)
    hypernym: greek deity - a deity worshipped by the ancient Greeks
  2. A medium that was once supposed to fill all space and to support the propagation of electromagnetic waves (synset 106265492)
    hypernym: medium - an intervening substance through which signals can travel as a means for communication
    synonym: ether

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