Big data

From Science Europe Data Glossary

Definition: Big data is an evolving term that describes any voluminous amount of structured, semi-structured and unstructured data that has the potential to be mined for information.
Explanation: Although big data does not refer to any specific quantity, the term is often used when speaking about petabytes and exabytes of data.
Reference: http://searchcloudcomputing.techtarget.com/definition/big-data-Big-Data