day trade noun 1verb 1forms 5 noun1 •A transaction in which units of stock or other investment instruments are purchased and then sold within a single market day.Netting a quick ten grand on a day trade of 1750 shares, he paid off his credit-card debts and gave his wife a ring with five diamonds. — 1998 verb1 •To engage, as a deliberate investment strategy, in the very short-term trading of stocks or other securities, by selling any given security within the same market day during which it was purchased.No one knows for sure how many people day trade. — 1999 formsday traded · day-traded · day trading · day trades · day-trades