af·ter·mar·ket

[af-ter-mahr-kit, ahf-]
noun
1.
the market for replacement parts, accessories, and equipment for the care or enhancement of the original product, especially an automobile, after its sale to the consumer: The company holds a large share in the automotive radio aftermarket.
2.
any additional market created by a product after the primary market: Television is the perfect aftermarket for old movies.
3.
Stock Exchange. secondary market.

Origin:
1935–40; after + market

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Aftermarket is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a scrap or morsel of food left at a meal.
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Example sentences
Car cams are also showing up in the auto aftermarket.
Interior is original except for new glove box needed when aftermarket stereo removed.
Imagine the aftermarket for improved and customized software.
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