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CQ

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Radio. a signal sent at the beginning of radiograms conveying general information or sent by an amateur as an invitation for any other amateur to reply.
Military. charge of quarters.
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British Dictionary definitions for CQ

CQ

noun
telegraphy telephony a symbol transmitted by an amateur radio operator requesting two-way communication with any other amateur radio operator listening
abbreviation for
military charge of quarters
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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