trading in stocks and bonds that does not take place on stock exchanges; such trading is most significant in the United States, where requirements ... Found on http://www.britannica.com/eb/a-z/o/41
A market in which securities transactions are conducted by dealers through a telephone and computer network connecting dealers in stocks and bonds. Also called OTC trading. Found on http://www.encyclo.co.uk/visitor-contributions.php
A communications network through which trades of bonds, non-listed stocks, and other securities take place. Trading activity is overseen by the National Association of Securities Dealers (NASD). Found on http://www.lectlaw.com/def2/o023.htm