: a markup language with use and design similar to HTML but employing tags defined by the user that can be used to indicate both the logical structure and the display specifications of the coded data

Examples of XML in a Sentence

Recent Examples on the Web Another VMware patch has been issued to fix an XML External Entity vulnerability affecting VMware vRealize Orchestrator that could lead to privilege escalation. Kate O'Flaherty, WIRED, 28 Feb. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'XML.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


X (from extensible) + markup language

First Known Use

1996, in the meaning defined above

Time Traveler
The first known use of XML was in 1996

Dictionary Entries Near XML

Cite this Entry

“XML.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/XML. Accessed 1 Oct. 2023.

More from Merriam-Webster on XML

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!