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DEFINITION of 'Standard Industrial Classification - SIC Code'. A standard series of four-digit codes created by the U.S. government in 1937 for categorizing business activities. In 1997, the use of SIC codes was replaced in most (but not all) capacities by a six-digit code called the North American Industry Classification System (NAICS).
meÂ·diÂ·ums or meÂ·diÂ·a (-dÄ-É) 1  Something, such as an intermediate course of action, that occupies a position or represents a condition midway between extremes. 2  An intervening substance through which something else is transmitted or carried on. 3  An agency by which something is accomplished, conveyed, or transferred.