[5] Dictionary.com was founded by Brian Kariger and Daniel Fierro as part of Lexico Publishing, which also started Thesaurus.com and Reference.com.

[5] Among its features, Dictionary.com offers a Word of the Day,[12] a crossword solver,[13] and a pop culture dictionary[14] that includes emoji and slang sections.

[15] The selection is based on search trends on the site throughout the year and the news events that drive them.

It also included audio pronunciations, alphabetical indexing, and synonym example sentences.

In early 2020, in response to COVID-19 quarantine home-schooling needs, Dictionary.com launched an interactive platform for learning at home, and an online tutoring service.