1. singular noun The aftermarket is all the related products that are sold after an item, especially a car, has been bought. [business] ⇒ The company serves the national automotive aftermarket with a broad range of accessory and recreational-vehicle products. 2. singular noun
The aftermarket in shares and bonds is the buying and selling of them after they have been issued. [business] ⇒ It's illegal to get into a formal agreement with investors that they'll buy in the aftermarket.
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