Meaning of CQ in English

I. (ˈ)sē|kyü

Etymology: abbreviation for call to quarters

— communication code letters used at the beginning of radiograms of general information or safety notices or by shortwave amateurs as an invitation to talk to other shortwave amateurs

II. abbreviation

1. charge of quarters

2. commercial quality

3. conceptual quotient

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.