Definition of iron triangle in English:

iron triangle

Pronunciation /ˌʌɪən ˈtrʌɪaŋɡl/ /ˌʌɪən ˈtrʌɪəŋɡl/


  • 1Military
    Any of various roughly triangular geographical zones regarded as heavily defended or densely populated by enemy forces.

  • 2A close alliance or relationship between three powerful groups, people, countries, etc.; especially (US, Politics) the interdependent relationship in a particular area of policy-making between a legislative committee, a bureaucratic agency, and an interest group.


1940s; earliest use found in On Target. From iron + triangle.