From Longman Business DictionaryDow Jones Industrial AverageˌDow Jones Inˌdustrial ˈAverage trademark abbreviation DJIA [singular]FINANCE a share index of about 30 leading companies, whose movements show the direction of the New York stockmarket as a whole. The Dow Jones Industrial Average is the most important index, often referred to as the Dow JonesThe Dow Jones Industrial Average closed down 147.49, a loss of 1.41%. → average