Definitions

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

  • noun The act or process of setting into operation or motion.
  • noun A business or undertaking that has recently begun operation.

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

  • noun the act or process of starting a process or machine
  • noun a new organization or business venture

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From start + up.

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