G-Man (slang) G-Man (slang) G-Man (short for "Government Man") is an American slang term for special agents of the United States Government. It is specifically used as a term for a Federal Bureau of Investigation (FBI) agent. "G-Man" is also a term used for members of G Division, essentially a British anti-rebel police unit operating out of Dublin Castle prior to Irish Independence in 1922. Colonel Ned Broy uses the term in his official testimony for the Irish Army's Bureau of Military History in their archive of the Easter Rising (1916) and the Irish War of Independence (1919-1921). According to the "Merriam-Webster
The g Factor: The Science of Mental Ability speed and efficiency of neural processes. The book argues that the "g" factor shows considerable practical validity. It is related to a large number of economically, educationally, and socially valued attributes. It is a particularly good predictor of academic and job-related outcomes. It stresses the difference between "g" and what it calls "vehicles" of "g". Changes in test scores do not necessarily represent changes in the underlying construct, viz., "g". Practice effects on test scores appear to be unrelated to "g". An authentic change in "g" happens when the change shows broad generalizability to a wide variety of cognitive tasks.