Definitions of trader
a person who buys and sells stocks and other securities
He failed to supervise Martinson and a fellow trader properly, allowing them to conduct insider deals.
a person who is in the business of buying and selling goods
Some outdoor traders were concerned that there would not be enough space for the current level of stallholders.
a person who runs a business
The company was founded in 1994 by Kevin Lynch, who had been carrying out contracting work as a sole trader since 1983.