ethereal vs transient

ethereal

adj
  • Pertaining to the (real or hypothetical) upper, purer air, or to the higher regions beyond the earth or beyond the atmosphere. 

  • Consisting of ether; hence, exceedingly light or airy; tenuous; spiritlike; characterized by extreme delicacy, as form, manner, thought, etc. 

  • To do with diethyl ether. 

  • Pertaining to the immaterial realm, as symbolically represented by, or (in earlier epochs) conflated with, such atmospheric and extra-atmospheric concepts. 

transient

noun
  • A relatively loud, non-repeating signal in an audio waveform that occurs very quickly, such as the attack of a snare drum. 

  • A homeless person. 

  • homestay 

  • A transient phenomenon, especially an electric current; a very brief surge. 

  • A module that generally remains in memory only for a short time. 

  • Something that is transient. 

  • A person who passes through a place for a short time; a traveller; a migrant worker. 

adj
  • Intermediate. 

  • Occasional; isolated; one-off 

  • having a positive probability of being left and never being visited again. 

  • Passing or disappearing with time; transitory. 

  • Decaying with time, especially exponentially. 

  • Operating beyond itself; having an external effect. 

  • Passing through; passing from one person to another. 

  • Remaining for only a brief time. 

How often have the words ethereal and transient occurred in a corpus of books? (source: Google Ngram Viewer )