XML Definition
ĕksĕm-ĕl
noun
An international standard metalanguage for creating markup languages that structure digital information in a way that allows for the exchange, display, and storage of data independent of proprietary operating systems and hardware devices.
American Heritage
abbreviation
Extensible Markup Language.
Webster's New World
Origin of XML
Ex(tensible) M(arkup) L(anguage)
From American Heritage Dictionary of the English Language, 5th Edition