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adware

[ad-wair]
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noun Computers.
  1. software that displays advertisements and is integrated into another program offered at no charge or at low cost.
  2. a type of spyware that gathers information about an Internet user's browsing habits and displays targeted or contextual advertisements.
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Origin of adware

1980–85; ad(vertising-supported) + (soft)ware
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for adware

adware

noun
  1. a type of computer software that collects information about a user's browsing patterns in order to display relevant advertisements in his or her Web browser
  2. computer software that is given to a user with advertisements already embedded
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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 adware

n.

2000 (earlier as the name of a software company), from ad (n.) + -ware, abstracted from software, etc.

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Online Etymology Dictionary, © 2010 Douglas Harper