intersidereal en · ADJ
Etymology
From inter- + sidereal.
Meanings
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(not-comparable) Between or among constellations or stars; interstellar.
— OK.... now, if the traveller comes back to Earth, he will have aged eight minutes when his children would be eight years older! — Exactly... That's why all intersidereal explorers who have reached the fifth level of consciousness never come back[…]
2015, Laurent Pommès, The Next Step of Humanity: