"The act of removing a row header or replacing a row header in a report to summarize the rows of the answer set. Sometimes called dynamic aggregation." (Ralph Kimball & Margy Ross, "The Data Warehouse Toolkit" 2nd Ed , 2002)
"To present higher levels of summarization. " (Ralph Kimball & Margy Ross, "The Data Warehouse Toolkit" 2nd Ed., 2002)
"Method of analysis for retrieving higher levels of summary data starting from detailed data." (Paulraj Ponniah, "Data Warehousing Fundamentals for IT Professionals", 2010)
"Data analysis performed on a data set with applied mathematical functions, associated with fewer dimensions, higher levels of hierarchy in one or more dimensions, or both." (DAMA International, "The DAMA Dictionary of Data Management", 2011)
"In SQL, an OLAP extension used with the GROUP BY clause to aggregate data by different dimensions. (Rolling up the data is the exact opposite of drilling down the data.)" (Carlos Coronel et al, "Database Systems: Design, Implementation, and Management" 9th Ed., 2011)
"To collect subsets of data from multiple locations in one location." (Microsoft, "SQL Server 2012 Glossary", 2012)
"The act of summarizing or aggregating data to a level higher than the previous level of detail." (Sharon Allen & Evan Terry, "Beginning Relational Data Modeling 2nd Ed.", 2005)
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