Past tense of 'air'; broadcast on television or radio, or expressed publicly.
From Middle English 'aire' from Old French 'air' from Latin 'aer.' The broadcasting sense developed in the early 20th century from the idea of sending signals through the air via radio waves.
The verb 'aired' beautifully captures how we've transformed the invisible medium of air into a carrier of information - from radio waves bouncing through the atmosphere to our modern concept of 'airing' grievances or opinions in public discourse.
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