Definition of ICQ:
I-seek-you. Internet communication program that works as an automatic search engine to locate people online on the web. Among other services, it allows the users to send emails that appear almost instantly on the intended parties screens, leave messages on message boards, engage in PC-to-PC and PC-to-phone calls through internet telephony, and to launch peer-to-peer applications. It has engendered thousands of ICQ Communities covering practically every imaginable interest or subject.
Meaning of ICQ & ICQ Definition