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Type of site
|Created by||Brian Kariger|
|Launched||May 14, 1995|
The content for Dictionary.com is based on the latest version of Random House Unabridged Dictionary, with other content from the Collins English Dictionary, American Heritage Dictionary and others. 
Dictionary.com was founded by Brian Kariger and Daniel Fierro as part of Lexico Publishing, which also started Thesaurus.com and Reference.com.  In July 2008, Lexico Publishing Group, LLC, was acquired by Ask.com, an IAC company,  and renamed Dictionary.com, LLC.  In 2018, IAC sold Dictionary.com and Thesaurus.com to Rock Holdings.  At the time of the sale, Dictionary.com was the 447th most trafficked website in the country, according to the website tracking service SimilarWeb. 
On Monday, May 3, 1999, Dictionary.com began its Word of the Day feature. 
In 2010, Dictionary.com began its annual Word of the Year feature with the word 'change'.  The selection is based on search trends on the site throughout the year and the news events that drive them. 
The following is the list of Dictionary.com's annual words starting in 2010: 
- 2010: Change
- 2011: Tergiversate
- 2012: Bluster
- 2013: Privacy
- 2014: Exposure
- 2015: Identity
- 2016: Xenophobia
- 2017: Complicit
- 2018: Misinformation
- 2019: Existential 
In April 2009, the company launched its first dictionary app in the iOS App Store allowing users to look up definitions and synonyms. The app also included access to audio pronunciations, alphabetical indexing, and synonym example sentences.  Since then, Dictonary.com released a standalone thesaurus app called Thesaurus Rex along with education apps, Dictionary.com Flashcards, Word Dynamo, and Learning to Read with Zoo Animals.
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- "Amended and Restated Operating Agreement of Dictionary.com, LLC". U.S. Securities and Exchange Commission. July 17, 2008. Retrieved October 14, 2019.
- Reindl, JC (November 15, 2018). "Cleveland Cavaliers owner Dan Gilbert just dipped into the online dictionary, thesaurus business". WKYC Studios.
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- "What Dictionary.com's words of the year say about us". cnn. Retrieved December 19, 2019.
- ""Existential' crowned word of the year by Dictionary.com". Click on Detroit. Retrieved December 19, 2019.
- Rao, Leena (April 8, 2009). "Dictionary.com Launches Free iPhone App". Tech Crunch.