1Attributive Designating an extreme left-wing terrorist organization operating in West Germany (and later Germany) between 1970 and 1998. Chiefly in "Baader–Meinhof gang (also group)".
2Attributive Designating a quirk of perception whereby a phenomenon to which one is newly alert suddenly seems ubiquitous. Chiefly in "Baader-Meinhof phenomenon".
Also called the frequency illusion.
3Without article: = "Baader–Meinhof gang".
1970s; earliest use found in The Hartford Courant. From the name of Bernd Andreas Baader + the name of Ulrike Meinhof, prominent members of the organization. Compare German Baader-Bande, lit. ‘Baader gang’, later also Baader-Meinhof-Bande, Baader-Meinhof-Gruppe.