This is the 3790th most frequent Russian word.
эфир
"Эфир" means "air" (as in a broadcast) or "ether."
Here, 'эфир' refers to the 'airwaves' or broadcasting time, commonly used in radio and television.
Телевизионная программа будет в эфире в восемь вечера.
The TV program will be on air at eight in the evening.
In this sentence, 'эфир' refers to 'ether,' a classical element or substance.
Таинство эфира окутано легендами в алхимической литературе.
The mystery of ether is shrouded in legends in alchemical literature.
Here, 'эфир' poetically describes the rarified and light feeling associated with air or space.