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app1

[ap]
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noun Computers.
  1. an application, typically a small, specialized program downloaded onto mobile devices: the best GPS apps for your iPhone.

Origin of app1

1985–90; shortening of application

app2

[ap]
noun
  1. Informal. an appetizer served before a meal.

Origin of app2

by shortening

app.

  1. apparatus.
  2. apparent.
  3. appendix.
  4. applied.
  5. appointed.
  6. approved.
  7. approximate.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for app

app

noun
  1. computing informal short for application program
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for app

n.

computerese shorthand for application, attested by 1992.

Online Etymology Dictionary, © 2010 Douglas Harper