Inside the Universes

'airwaves'

[air.n.08] as in: medium for radio and television broadcasting

Examples:
the program was on the air from 9 til midnight
the president used the airwaves to take his message to the people

Origins

					airwaves (English)
├── air (English)
│   └── air (Middle English (1100-1500))
│       └── aeir (Anglo-Norman)
└── wave (English)
    └── waven (Middle English (1100-1500))
        └── wafian (Old English (ca. 450-1100))