V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

WSDL
       Web Services Description Language (WWW, XML)


The Free On-line Dictionary of Computing (30 December 2018):

Web Service Definition Language
WSDL

    (WSDL) An XML format for describing network
   services as a set of endpoints operating on messages
   containing either "document oriented" or "procedure oriented"
   information.  The operations and messages are described
   abstractly, and then bound to a concrete network protocol and
   message format to define an endpoint.  Related concrete
   endpoints are combined into abstract endpoints
   (services).

   WSDL is typically used with SOAP over HTTP but it is
   extensible to allow description of endpoints and their
   messages independent of what message formats or network
   protocols.

   [Reference?]

   (2004-06-21)