surveillance or the gathering of information by surreptitious use of electronic devices, as in crime detection or espionage.
Origin of electronic surveillance
First recorded in 1970–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the use of such electronic devices as television monitors, video cameras, etc, to prevent burglary, shop lifting, break-ins, etc
monitoring events, conversations, etc, at a distance by electronic means, esp by such covert means as wiretapping or bugging
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012