tap / space
Classic usage
Reading level: hard
Estimated CEFR level: B2 — Upper-Intermediate
Estimated from word frequency; not an official CEFR classification.
From Roger, used circa 1940 in UK and US military communication to represent "R" when spelling out a word. "R" is the first letter in received, used to acknowledge understanding a message. "Roger" for "received" was in spoken usage in air traffic radio parlance by 1950.
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Classic usage
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