COMPUTER MEDIATED COMMUNICATION DEFINITION.

Computer-Mediated Communication (CMC) is the process by which people create, exchange, and perceive information using networked telecommunications systems (or non-networked computers) that facilitate encoding, transmitting, and decoding messages. Studies of CMC can view this process from a variety of interdisciplinary theoretical perspectives by focusing on some combination of people, technology, processes, or effects. Some of these perspectives include the social, cognitive/psychological, linguistic, cultural, technical, or political aspects; and/or draw on fields such as human communication, rhetoric and composition, media studies, human-computer interaction, journalism, telecommunications, computer science, technical communication, or information studies.

Referrences:
http://www.encyclopedia.com/doc/1O12-computermediatedcommunctn.html
http://www.webopedia.com/TERM/C/CMC.html