(Extensible Style Language) A specification for separating style from content when creating HTML or XML pages. The specifications work a lot like templates, allowing users to apply single style documents to multiple pages. XSL is the second style specification to be offered by the World Wide Web Consortium (W3C). The first specification is called Cascading Style Sheets (CSS). The Cascading Style Sheets specification is similar to XSL but is lacking two major innovations: First, XSL lets developers dictate the way Web pages are printed, and secondly, XSL specifications allow the transfer of XML documents across different applications.
Meaning of XSL in English
DAX English glossary of key connectivity terms. Английский глоссарий основных терминов по коммуникациям DAX. 2012