Meaning of ICQ | Babel Free

Definitions

1. A call for acknowledgement.
2. A program allowing users to send each other instant messages via the Internet.
   Internet

Equivalents

Examples

“ICQ was unusual among instant-messaging systems because it used what is called peer-to-peer technology—ICQ users essentially communicated with each other directly, without having all their messages pass through a central server.”

CEFR level