WordReference Random House Unabridged Dictionary of American English © 2019
af•ter•mar•ket  (aftər mär′kit, äf-),USA pronunciation n. 
  1. Communications, Businessthe market for replacement parts, accessories, and equipment for the care or enhancement of the original product, esp. an automobile, after its sale to the consumer:The company holds a large share in the automotive radio aftermarket.
  2. Communications, Businessany additional market created by a product after the primary market:Television is the perfect aftermarket for old movies.
  3. Stock Exchange, BusinessSee  secondary market. 
  • after + market 1935–40

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