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
Origin of On-air
Derived from early use of radio, literally sending the transmission on the air waves
From Wiktionary
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