Interdepartment Radio Advisory Committee

Interagency Research Animal Committee. Author of U.S. Principles and the focal point for coordinating Federal policies involving all animal species needed for biomedical research and testing, especially their care, use, and conservation.

International Radiocommunications Advisory Committee An committee established to provide advice to the ACA regarding international radiocommunications matters.

IRAC (pronounced EYE-rack) is an acronym that generally stands for: Issue, Rule, Analysis, and Conclusion. It functions as a methodology for legal analysis. The IRAC format is mostly used in hypothetical questions on law school exams.

Imported Refiners' Acquisition Cost. The average price for imported oil paid by U.S. refiners.