Définitions
1.AdjectivePertaining to the presupposition of an invisible air-like element permeating all of space, or to the higher regions beyond the earth or beyond the atmosphere."ethereal space; ethereal regions"
2.AdjectivePertaining to the immaterial realm, as symbolically represented by, or (in earlier epochs) conflated with, such atmospheric and extra-atmospheric concepts.
3.AdjectiveConsisting of ether; hence, exceedingly light or airy; tenuous; spiritlike; characterized by extreme delicacy, as form, manner, thought, etc.
4.NounEllipsis of ethereal wave (“music genre”).