Definitions

1. noun

A CQ is a call used in radio communication to request the caller’s identity.

“The pilot responded to the CQ with his aircraft’s call sign.”

2. interjection

CQ is used as an interjection to get someone’s attention, often in a situation where radio communication is used.

“CQ, this is station Delta-1.”

3. verb

To CQ someone means to call out to them over a radio or other communication device.

“She CQed her friend on the radio to let him know she was on her way.”