Radio: From the Latin for ‘Beam’

Radio: The transmission and reception of electromagnetic waves of radio frequency.

‘Radio’, as a word, has been in use in England since 1907 and is a shortening of ‘radio-receiver’. It can be traced back to the Latin word ‘radius’, meaning ‘beam’.
It was much more common to call a radio a wireless (shortening of ‘wireless receiver’) until world war II when its use as a military term spread to the wider population.

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