acknowledged; a radio communication signal meaning 'message received and understood.'
From military/aviation radio protocol, where names beginning with each letter were assigned as code words. 'Roger' was chosen for the letter 'R,' and the phrase evolved into 'Roger that' meaning confirmation.
The word 'roger' is proof that language gets invented for practical reasons—military pilots needed a clear way to confirm messages over crackling radios, so they picked a name, and now we all use it in everyday speech.
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