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

ETL
       Extraction, Transformation and Loading


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

ETL

    The processes of Extracting, Transforming (or
   Transporting), and Loading data from source systems into a
   data warehouse.

   (2003-12-31)