an agent of a secret service.
(loosely) a person employed to collect the military secrets of one country and relay them to another, especially a person living in a foreign country while so working for his or her own nation; spy.
Origin of secret agent
First recorded in 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for secret agent
Contemporary Examples of secret agent
And at times the tricky part, the hard part, is finding out what that secret-agent mission is.Sanford's 'Secret-Agent Mission'
September 7, 2009
a person employed in espionage
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