On-air Definition

ŏnâr, ôn-
adjective
(while) Broadcasting or being broadcast.
Webster's New World
adverb

Actually broadcasting on a radio or television station (as opposed to just recording for later transmission).

He didn't realise he had made his remarks on-air.
Wiktionary

Used other than as an idiom: see on,‎ air.

Wiktionary

(broadcasting) Transmitting live.

Wiktionary
Wiktionary
Wiktionary
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Origin of On-air

  • Derived from early use of radio, literally sending the transmission on the air waves

    From Wiktionary

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