Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The market for parts and accessories used in the upkeep or enhancement of a previous purchase, as of a car or computer.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun business The market for goods and services surrounding capital purchases of equipment and of software.
  • noun business The industry that serves that market, eg, in automobiles, computers.
  • noun finance Trading activity in a security immediately following its initial offering to the public.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

after +‎ market

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